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The Periodic Table

The Periodic Table is a chart that organizes all known chemical elements based on their atomic number and properties. It helps scientists understand how elements behave and interact, grouping them into families with similar characteristics.

Learning the Periodic Table makes chemistry easier by helping predict chemical reactions, understand material properties, and apply science in real-world fields like medicine, engineering, and technology. It’s a key tool for anyone studying science!

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Lanthanides

Actinides

Hydrogen (H)

Atomic Number: 1

Hydrogen is the lightest element and the most abundant in the universe. It fuels nuclear fusion in stars and is used in fuel cells.

Helium (He)

Atomic Number: 2

Helium is an inert noble gas used in cryogenics, for inflating balloons, and as a cooling medium in MRI scanners.

Lithium (Li)

Atomic Number: 3

Lithium is used in rechargeable batteries for electronics and electric vehicles, and in mood-stabilizing medications.

Beryllium (Be)

Atomic Number: 4

Beryllium is a lightweight, strong metal used in aerospace components and X-ray windows due to its high transparency to X-rays.

Boron (B)

Atomic Number: 5

Boron is essential for plant growth and is used in borosilicate glass, which is highly resistant to thermal shock.

Carbon (C)

Atomic Number: 6

Carbon forms the backbone of organic chemistry and exists in various allotropes such as diamond, graphite, and graphene.

Nitrogen (N)

Atomic Number: 7

Nitrogen makes up about 78% of the Earth’s atmosphere and is vital for synthesizing proteins and nucleic acids.

Oxygen (O)

Atomic Number: 8

Oxygen is essential for respiration in most living organisms and supports combustion.

Fluorine (F)

Atomic Number: 9

Fluorine is the most electronegative element, used in the production of Teflon and in toothpaste to prevent cavities.

Neon (Ne)

Atomic Number: 10

Neon emits a distinctive reddish‑orange glow when electrified and is commonly used in neon signs.

Sodium (Na)

Atomic Number: 11

Sodium is a highly reactive metal found in salt; it is essential for nerve impulse transmission and fluid balance.

Magnesium (Mg)

Atomic Number: 12

Magnesium is used in lightweight alloys and is vital for enzyme function and energy production in cells.

Aluminium (Al)

Atomic Number: 13

Aluminium is lightweight and corrosion‑resistant, making it ideal for packaging, transportation, and construction.

Silicon (Si)

Atomic Number: 14

Silicon is a semiconductor essential for modern electronics and is the second most abundant element in the Earth’s crust.

Phosphorus (P)

Atomic Number: 15

Phosphorus is crucial for energy transfer in cells (ATP) and is a key component of fertilizers for plant growth.

Sulfur (S)

Atomic Number: 16

Sulfur is used in the vulcanization of rubber and in the production of sulfuric acid; it naturally occurs as a yellow solid.

Chlorine (Cl)

Atomic Number: 17

Chlorine is a powerful disinfectant used to treat water and in the manufacture of a wide range of consumer products.

Argon (Ar)

Atomic Number: 18

Argon is an inert noble gas used in lighting and welding, making up about 1% of the Earth’s atmosphere.

Potassium (K)

Atomic Number: 19

Potassium is vital for nerve function and muscle contraction and is abundant in foods like bananas.

Calcium (Ca)

Atomic Number: 20

Calcium is essential for strong bones and teeth and plays a crucial role in blood clotting and muscle function.

Scandium (Sc)

Atomic Number: 21

Scandium is a rare metal used in aerospace components and sporting goods for its strength and light weight.

Titanium (Ti)

Atomic Number: 22

Titanium is known for its high strength-to-weight ratio and corrosion resistance, used extensively in aerospace and medical implants.

Vanadium (V)

Atomic Number: 23

Vanadium is added to steel to improve its strength and is used in aerospace and chemical industries.

Chromium (Cr)

Atomic Number: 24

Chromium is used for plating to give metals a shiny finish and is a key component in stainless steel.

Manganese (Mn)

Atomic Number: 25

Manganese is crucial in steel production and functions as a cofactor for many enzymes in biological systems.

Iron (Fe)

Atomic Number: 26

Iron is the main component of steel and is essential for oxygen transport in the blood via hemoglobin.

Cobalt (Co)

Atomic Number: 27

Cobalt is used in rechargeable batteries and superalloys, and is an essential trace element in the human diet.

Nickel (Ni)

Atomic Number: 28

Nickel is prized for its durability and corrosion resistance, making it common in stainless steel and coinage.

Copper (Cu)

Atomic Number: 29

Copper is highly conductive and is used in electrical wiring, plumbing, and various industrial applications.

Zinc (Zn)

Atomic Number: 30

Zinc is used to galvanize steel to prevent rust and is an important trace nutrient in human biology.

Gallium (Ga)

Atomic Number: 31

Gallium melts just above room temperature and is used in semiconductors and LED technology.

Germanium (Ge)

Atomic Number: 32

Germanium is a semiconductor material used in transistors and infrared optical equipment.

Arsenic (As)

Atomic Number: 33

Arsenic is toxic but finds use in semiconductors and pesticides; its compounds have been studied extensively.

Selenium (Se)

Atomic Number: 34

Selenium is used in photocells, glassmaking, and is essential in trace amounts for human health.

Bromine (Br)

Atomic Number: 35

Bromine is a dark liquid at room temperature used in flame retardants and pesticides.

Krypton (Kr)

Atomic Number: 36

Krypton is a noble gas used in high‑performance lighting and flash photography.

Rubidium (Rb)

Atomic Number: 37

Rubidium is highly reactive and is used in atomic clocks and research on specialty glasses.

Strontium (Sr)

Atomic Number: 38

Strontium produces a bright red color in fireworks and is used in medical imaging and bone studies.

Yttrium (Y)

Atomic Number: 39

Yttrium is used in LED displays, superconductors, and phosphors for color TVs and LEDs.

Zirconium (Zr)

Atomic Number: 40

Zirconium is prized for its corrosion resistance and is used in nuclear reactors and dental ceramics.

Niobium (Nb)

Atomic Number: 41

Niobium is used to improve steel strength and in superconducting magnets.

Molybdenum (Mo)

Atomic Number: 42

Molybdenum is used in high‑strength steel alloys and has excellent high‑temperature properties.

Technetium (Tc)

Atomic Number: 43

Technetium is the lightest radioactive element and is used in medical diagnostic imaging.

Ruthenium (Ru)

Atomic Number: 44

Ruthenium is used in electrical contacts and thick‑film resistors, and it enhances the durability of platinum alloys.

Rhodium (Rh)

Atomic Number: 45

Rhodium is a rare precious metal used in catalytic converters and for plating jewelry due to its brilliant finish.

Palladium (Pd)

Atomic Number: 46

Palladium is used extensively in catalytic converters and electronics, and it resists corrosion very well.

Silver (Ag)

Atomic Number: 47

Silver has the highest electrical conductivity of all metals and is used in jewelry, coins, and industrial applications.

Cadmium (Cd)

Atomic Number: 48

Cadmium is used in rechargeable batteries and pigments, though its toxicity means its use is strictly regulated.

Indium (In)

Atomic Number: 49

Indium is used in touchscreens and LCDs, prized for its ability to form transparent conductive coatings.

Tin (Sn)

Atomic Number: 50

Tin is used as a protective coating (tin plating) and in solder due to its low melting point.

Antimony (Sb)

Atomic Number: 51

Antimony is used in flame retardants and lead‑acid batteries, and it has historical use in alloys.

Tellurium (Te)

Atomic Number: 52

Tellurium is used in thermoelectric devices and as a semiconductor dopant, aiding advanced electronics.

Iodine (I)

Atomic Number: 53

Iodine is essential for thyroid function and is used as an antiseptic and in nutritional supplements.

Xenon (Xe)

Atomic Number: 54

Xenon is a heavy, inert gas used in high‑intensity lamps and anesthesia, prized for its luminescence.

Cesium (Cs)

Atomic Number: 55

Cesium is used in atomic clocks for precise timekeeping and in drilling fluids in the oil industry.

Barium (Ba)

Atomic Number: 56

Barium is used in medical X‑ray imaging of the gastrointestinal tract and in fireworks for its green color.

Hafnium (Hf)

Atomic Number: 72

Hafnium is used in high‑temperature alloys and nuclear reactor control rods.

Tantalum (Ta)

Atomic Number: 73

Tantalum is a corrosion‑resistant metal used in electronics and capacitors.

Tungsten (W)

Atomic Number: 74

Tungsten has the highest melting point of all metals and is used in light bulb filaments.

Rhenium (Re)

Atomic Number: 75

Rhenium is a rare metal used in superalloys and high‑temperature catalysts.

Osmium (Os)

Atomic Number: 76

Osmium is the densest naturally occurring element and is used in fountain pen nibs.

Iridium (Ir)

Atomic Number: 77

Iridium is a very hard, brittle metal used in high‑strength alloys.

Platinum (Pt)

Atomic Number: 78

Platinum is a precious metal used in jewelry, catalytic converters, and laboratory equipment.

Gold (Au)

Atomic Number: 79

Gold is a highly valued precious metal used in jewelry, electronics, and as a store of value.

Mercury (Hg)

Atomic Number: 80

Mercury is the only metal that is liquid at room temperature and is used in thermometers.

Thallium (Tl)

Atomic Number: 81

Thallium is a toxic metal formerly used in rodenticides and electronics.

Lead (Pb)

Atomic Number: 82

Lead is a heavy metal used in batteries and radiation shielding, though its use is now limited.

Bismuth (Bi)

Atomic Number: 83

Bismuth is a heavy, brittle metal used in cosmetics and low‑melting alloys.

Polonium (Po)

Atomic Number: 84

Polonium is a highly radioactive element discovered by Marie Curie, used in anti‑static devices.

Astatine (At)

Atomic Number: 85

Astatine is a rare, highly radioactive element with properties that are not well known.

Radon (Rn)

Atomic Number: 86

Radon is a radioactive noble gas that can accumulate in buildings and poses health risks.

Francium (Fr)

Atomic Number: 87

Francium is one of the rarest naturally occurring elements and is highly radioactive with a very short half‑life.

Radium (Ra)

Atomic Number: 88

Radium was once used in luminous paints for watches and instruments but is now avoided due to its intense radioactivity.

Rutherfordium (Rf)

Atomic Number: 104

Rutherfordium is a synthetic element named after Ernest Rutherford and is produced in particle accelerators.

Dubnium (Db)

Atomic Number: 105

Dubnium is a synthetic element named after Dubna, Russia, and is highly radioactive with no commercial use.

Seaborgium (Sg)

Atomic Number: 106

Seaborgium is named after Glenn T. Seaborg and is a synthetic, highly radioactive element used in research.

Bohrium (Bh)

Atomic Number: 107

Bohrium is named in honor of Niels Bohr and is a synthetic element with a very short half‑life.

Hassium (Hs)

Atomic Number: 108

Hassium is a synthetic element named after the German state of Hesse and is extremely radioactive.

Meitnerium (Mt)

Atomic Number: 109

Meitnerium is named after physicist Lise Meitner and is a synthetic element produced in minute quantities.

Darmstadtium (Ds)

Atomic Number: 110

Darmstadtium is a synthetic element named after Darmstadt, Germany, and has been produced only in small amounts.

Roentgenium (Rg)

Atomic Number: 111

Roentgenium is named after Wilhelm Röntgen, the discoverer of X‑rays, and is a synthetic superheavy element.

Copernicium (Cn)

Atomic Number: 112

Copernicium is a synthetic element named after Nicolaus Copernicus and is produced in particle accelerators.

Nihonium (Nh)

Atomic Number: 113

Nihonium is a synthetic element named after Japan (Nihon) and is one of the heaviest elements produced.

Flerovium (Fl)

Atomic Number: 114

Flerovium is a superheavy synthetic element named after the Flerov Laboratory in Russia; its properties are predicted to be inert.

Moscovium (Mc)

Atomic Number: 115

Moscovium is a synthetic element named after Moscow and is extremely unstable and radioactive.

Livermorium (Lv)

Atomic Number: 116

Livermorium is a synthetic element named after the Lawrence Livermore National Laboratory and is highly radioactive.

Tennessine (Ts)

Atomic Number: 117

Tennessine is a synthetic element named after the state of Tennessee and is one of the superheavy elements.

Oganesson (Og)

Atomic Number: 118

Oganesson is a superheavy, synthetic element named in honor of Yuri Oganessian; its properties are still under investigation.

Actinium (Ac)

Atomic Number: 89

Actinium is a radioactive element used in cancer treatment research and as a neutron source.

Thorium (Th)

Atomic Number: 90

Thorium is considered a potential alternative nuclear fuel due to its abundance and energy potential.

Protactinium (Pa)

Atomic Number: 91

Protactinium is a rare, highly radioactive metal used mainly for scientific research.

Uranium (U)

Atomic Number: 92

Uranium is used as fuel in nuclear reactors and weapons; it is known for its high density and radioactivity.

Neptunium (Np)

Atomic Number: 93

Neptunium is a radioactive actinide used in nuclear reactors and research on breeder reactors.

Plutonium (Pu)

Atomic Number: 94

Plutonium is a key material for nuclear weapons and reactor fuel, known for its extreme radioactivity.

Americium (Am)

Atomic Number: 95

Americium is used in smoke detectors and industrial gauges; it is a man‑made radioactive element.

Curium (Cm)

Atomic Number: 96

Curium is a synthetic radioactive element named after Marie and Pierre Curie, used only for research.

Berkelium (Bk)

Atomic Number: 97

Berkelium is a synthetic actinide used in scientific research with no significant commercial applications.

Californium (Cf)

Atomic Number: 98

Californium is used in neutron moisture gauges and to initiate nuclear fission reactions; it is highly radioactive.

Einsteinium (Es)

Atomic Number: 99

Einsteinium is a synthetic, highly radioactive element discovered in nuclear explosions and named after Albert Einstein.

Fermium (Fm)

Atomic Number: 100

Fermium is a synthetic element produced in nuclear explosions and used only for research due to its radioactivity.

Mendelevium (Md)

Atomic Number: 101

Mendelevium is named after Dmitri Mendeleev, the creator of the periodic table, and is produced in particle accelerators.

Nobelium (No)

Atomic Number: 102

Nobelium is a synthetic element named after Alfred Nobel and is used solely for research purposes.

Lawrencium (Lr)

Atomic Number: 103

Lawrencium is named after Ernest O. Lawrence and is a synthetic element with limited practical applications.

Lanthanum (La)

Atomic Number: 57

Lanthanum is used in camera and telescope lenses and in high‑intensity carbon arc lamps.

Cerium (Ce)

Atomic Number: 58

Cerium is used in catalytic converters and as a polishing agent in glassmaking.

Praseodymium (Pr)

Atomic Number: 59

Praseodymium is used in high‑strength magnets and aircraft engines due to its unique magnetic properties.

Neodymium (Nd)

Atomic Number: 60

Neodymium magnets are among the strongest permanent magnets and are used in headphones, hard drives, and wind turbines.

Promethium (Pm)

Atomic Number: 61

Promethium is a rare, radioactive element used in luminous paint and research applications.

Samarium (Sm)

Atomic Number: 62

Samarium is used in specialized magnets that perform well at high temperatures and in nuclear reactors.

Europium (Eu)

Atomic Number: 63

Europium is essential for red phosphors in LED and fluorescent lighting and is highly luminescent.

Gadolinium (Gd)

Atomic Number: 64

Gadolinium is used in MRI contrast agents and in nuclear reactors due to its excellent neutron absorption.

Terbium (Tb)

Atomic Number: 65

Terbium is used in green phosphors for lighting and display devices and in magnetostrictive alloys.

Dysprosium (Dy)

Atomic Number: 66

Dysprosium is used in high‑performance magnets and nuclear reactor control rods due to its high neutron absorption.

Holmium (Ho)

Atomic Number: 67

Holmium has the highest magnetic strength of any element and is used in lasers and nuclear applications.

Erbium (Er)

Atomic Number: 68

Erbium is used as a dopant in fiber optics and lasers, particularly in telecommunications.

Thulium (Tm)

Atomic Number: 69

Thulium is the least abundant of the rare earth elements and is used in portable X‑ray devices.

Ytterbium (Yb)

Atomic Number: 70

Ytterbium is used in stainless steel and as a dopant in fiber lasers for high‑power applications.

Lutetium (Lu)

Atomic Number: 71

Lutetium is the heaviest and most stable rare earth element, used in PET scanners and as a catalyst.