The number of protons in the nucleus of every atom of a chemical element is known as the atomic number or proton number (symbol Z). A chemical element’s atomic number is the only way to identify it. It is the same as the nucleus’ charge number. The atomic number is also equivalent to the number of electrons in an uncharged atom.
Atomic Number and Atomic Weight
| Name of the Element | Symbol of the Element | Atomic Number | Atomic Weight (amu, g/mol) |
|---|---|---|---|
| Hydrogen | H | 1 | 1.00797 |
| Helium | He | 2 | 4.0026 |
| Lithium | Li | 3 | 6.941 |
| Beryllium | Be | 4 | 9.01218 |
| Boron | B | 5 | 10.81 |
| Carbon | C | 6 | 12.011 |
| Nitrogen | N | 7 | 14.0067 |
| Oxygen | O | 8 | 15.9994 |
| Fluorine | F | 9 | 18.998403 |
| Neon | Ne | 10 | 20.179 |
| Sodium | Na | 11 | 22.98977 |
| Magnesium | Mg | 12 | 24.305 |
| Aluminium | Al | 13 | 26.98154 |
| Silicon | Si | 14 | 28.0855 |
| Phosphorus | P | 15 | 30.97376 |
| Sulfur | S | 16 | 32.06 |
| Chlorine | Cl | 17 | 35.453 |
| Argon | Ar | 18 | 39.0983 |
| Potassium | 19 | 39.948 | |
| Calcium | Ca | 20 | 40.08 |
| Scandium | Sc | 21 | 44.9559 |
| Titanium | Ti | 22 | 47.9 |
| Vanadium | V | 23 | 50.9415 |
| Chromium | Cr | 24 | 51.996 |
| Manganese | Mn | 25 | 54.938 |
| Iron | Fe | 26 | 55.847 |
| Cobalt | Co | 27 | 58.7 |
| Nickel | Ni | 28 | 58.9332 |
| Copper | Cu | 29 | 63.546 |
| Zinc | Zn | 30 | 65.38 |
| Gallium | Ga | 31 | 69.72 |
| Germanium | Ge | 32 | 72.59 |
| Arsenic | As | 33 | 74.9216 |
| Selenium | Se | 34 | 78.96 |
| Bromine | Br | 35 | 79.904 |
| Krypton | Kr | 36 | 83.8 |
| Rubidium | Rb | 37 | 85.4678 |
| Strontium | Sr | 38 | 87.62 |
| Yttrium | Y | 39 | 88.9059 |
| Zirconium | Zr | 40 | 91.22 |
| Niobium | Nb | 41 | 92.9064 |
| Molybdenum | Mo | 42 | 95.94 |
| Technetium | Tc | 43 | 98 |
| Ruthenium | Ru | 44 | 101.07 |
| Rhodium | Rh | 45 | 102.9055 |
| Palladium | Pd | 46 | 106.4 |
| Silver | Ag | 47 | 107.868 |
| Cadmium | Cd | 48 | 112.41 |
| Indium | In | 49 | 114.82 |
| Tin | Sn | 50 | 118.69 |
| Antimony | Sb | 51 | 121.75 |
| Tellurium | Te | 52 | 126.9045 |
| Iodine | I | 53 | 127.6 |
| Xenon | Xe | 54 | 131.3 |
| Cesium | Cs | 55 | 132.9054 |
| Barium | Ba | 56 | 137.33 |
| Lanthanum | La | 57 | 138.9055 |
| Cerium | Ce | 58 | 140.12 |
| Praseodymium | Pr | 59 | 140.9077 |
| Neodymium | Nd | 60 | 144.24 |
| Promethium | Pm | 61 | 145 |
| Samarium | Sm | 62 | 150.4 |
| Europium | Eu | 63 | 151.96 |
| Gadolinium | Gd | 64 | 157.25 |
| Terbium | Tb | 65 | 158.9254 |
| Dysprosium | Dy | 66 | 162.5 |
| Holmium | Ho | 67 | 164.9304 |
| Erbium | Er | 68 | 167.26 |
| Thulium | Tm | 69 | 168.9342 |
| Ytterbium | Yb | 70 | 173.04 |
| Lutetium | Lu | 71 | 174.967 |
| Hafnium | Hf | 72 | 178.49 |
| Tantalum | Ta | 73 | 180.9479 |
| Tungsten | W | 74 | 183.85 |
| Rhenium | Re | 75 | 186.207 |
| Osmium | Os | 76 | 190.2 |
| Iridium | Ir | 77 | 192.22 |
| Platinum | Pt | 78 | 195.09 |
| Gold | Au | 79 | 196.9665 |
| Mercury | Hg | 80 | 200.59 |
| Thallium | Tl | 81 | 204.37 |
| Lead | Pb | 82 | 207.2 |
| Bismuth | Bi | 83 | 208.9804 |
| Polonium | Po | 84 | 209 |
| Astatine | At | 85 | 210 |
| Radon | Rn | 86 | 222 |
| Francium | Fr | 87 | 223 |
| Radium | Ra | 88 | 226.0254 |
| Actinium | Ac | 89 | 227.0278 |
| Thorium | Th | 90 | 231.0359 |
| Protactinium | Pa | 91 | 232.0381 |
| Uranium | U | 92 | 237.0482 |
| Neptunium | Np | 93 | 238.029 |
| Plutonium | Pu | 94 | 242 |
| Americium | Am | 95 | 243 |
| Curium | Cm | 96 | 247 |
| Berkelium | Bk | 97 | 247 |
| Californium | Cf | 98 | 250 |
| Einsteinium | Es | 99 | 251 |
| Fermium | Fm | 100 | 252 |
| Mendelevium | Md | 101 | 255 |
| Nobelium | No | 102 | 256 |
| Lawrencium | Lr | 103 | 257 |
| Rutherfordium | Rf | 104 | 258 |
| Dubnium | Db | 105 | 260 |
| Seaborgium | Sg | 106 | 261 |
| Bohrium | Bh | 107 | 262 |
| Hassium | Hs | 108 | 262 |
| Meitnerium | Mt | 109 | 263 |
| Darmstadtium | Ds | 110 | 269 |
| Roentgenium | Rg | 111 | 272 |
| Copernicium | Cn | 112 | 277 |
| Nihonium | Nh | 113 | 286 |
| Flerovium | Fl | 114 | 289 |
| Moscovium | Mc | 115 | 289 |
| Livermorium | Lv | 116 | 293 |
| Tennessine | Ts | 117 | 294 |
| Oganesson | Og | 118 | 294 |
What is the Atomic Number of Zirconium?
Answer
The Atomic Number of Zirconium is 40.
What is the Atomic Number of Zinc?
Answer
The Atomic Number of Zinc is 30.
What is the Atomic Number of Yttrium?
Answer
The Atomic Number of Yttrium is 39.
What is the Atomic Number of Ytterbium?
Answer
The Atomic Number of Ytterbium is 70.
What is the Atomic Number of Xenon?
Answer
The Atomic Number of Xenon is 54.
What is the Atomic Number of Vanadium?
Answer
The Atomic Number of Vanadium is 23.
What is the Atomic Number of Uranium?
Answer
The Atomic Number of Uranium is 92.
What is the Atomic Number of Tungsten?
Answer
The Atomic Number of Tungsten is 74.
What is the Atomic Number of Titanium?
Answer
The Atomic Number of Titanium is 22.
What is the Atomic Number of Tin?
Answer
The Atomic Number of Tin is 50.
What is the Atomic Number of Thulium?
Answer
The Atomic Number of Thulium is 69.
What is the Atomic Number of Thorium?
Answer
The Atomic Number of Thorium is 90.
What is the Atomic Number of Thallium?
Answer
The Atomic Number of Thallium is 81.
What is the Atomic Number of Terbium?
Answer
The Atomic Number of Terbium is 65.
What is the Atomic Number of Tennessine?
Answer
The Atomic Number of Tennessine is 117.
What is the Atomic Number of Tellurium?
Answer
The Atomic Number of Tellurium is 52.
What is the Atomic Number of Technetium?
Answer
The Atomic Number of Technetium is 43.
What is the Atomic Number of Tantalum?
Answer
The Atomic Number of Tantalum is 73.
What is the Atomic Number of Sulfur?
Answer
The Atomic Number of Sulfur is 16.
What is the Atomic Number of Strontium?
Answer
The Atomic Number of Strontium is 38.
What is the Atomic Number of Sodium?
Answer
The Atomic Number of Sodium is 11.
What is the Atomic Number of Silver?
Answer
The Atomic Number of Silver is 47.
What is the Atomic Number of Silicon?
Answer
The Atomic Number of Silicon is 14.
What is the Atomic Number of Selenium?
Answer
The Atomic Number of Selenium is 34.
What is the Atomic Number of Seaborgium?
Answer
The Atomic Number of Seaborgium is 106.
What is the Atomic Number of Scandium?
Answer
The Atomic Number of Scandium is 21.
What is the Atomic Number of Samarium?
Answer
The Atomic Number of Samarium is 62.
What is the Atomic Number of Rutherfordium?
Answer
The Atomic Number of Rutherfordium is 104.
What is the Atomic Number of Ruthenium?
Answer
The Atomic Number of Ruthenium is 44.
What is the Atomic Number of Rubidium?
Answer
The Atomic Number of Rubidium is 37.
What is the Atomic Number of Roentgenium?
Answer
The Atomic Number of Roentgenium is 111.
What is the Atomic Number of Rhodium?
Answer
The Atomic Number of Rhodium is 45.
What is the Atomic Number of Rhenium?
Answer
The Atomic Number of Rhenium is 75.
What is the Atomic Number of Radon?
Answer
The Atomic Number of Radon is 86.
What is the Atomic Number of Radium?
Answer
The Atomic Number of Radium is 88.
What is the Atomic Number of Protactinium?
Answer
The Atomic Number of Protactinium is 91.
What is the Atomic Number of Promethium?
Answer
The Atomic Number of Promethium is 61.
What is the Atomic Number of Praseodymium?
Answer
The Atomic Number of Praseodymium is 59.
What is the Atomic Number of Potassium?
Answer
The Atomic Number of Potassium is 19.
What is the Atomic Number of Polonium?
Answer
The Atomic Number of Polonium is 84.
What is the Atomic Number of Plutonium?
Answer
The Atomic Number of Plutonium is 94.
What is the Atomic Number of Platinum?
Answer
The Atomic Number of Platinum is 78.
What is the Atomic Number of Phosphorus?
Answer
The Atomic Number of Phosphorus is 15.
What is the Atomic Number of Palladium?
Answer
The Atomic Number of Palladium is 46.
What is the Atomic Number of Oxygen?
Answer
The Atomic Number of Oxygen is 8.
What is the Atomic Number of Osmium?
Answer
The Atomic Number of Osmium is 76.
What is the Atomic Number of Oganesson?
Answer
The Atomic Number of Oganesson is 118.
What is the Atomic Number of Nobelium?
Answer
The Atomic Number of Nobelium is 102.
What is the Atomic Number of Nitrogen?
Answer
The Atomic Number of Nitrogen is 7.
What is the Atomic Number of Niobium?
Answer
The Atomic Number of Niobium is 41.
What is the Atomic Number of Nihonium?
Answer
The Atomic Number of Nihonium is 113.
What is the Atomic Number of Nickel?
Answer
The Atomic Number of Nickel is 28.
What is the Atomic Number of Neptunium?
Answer
The Atomic Number of Neptunium is 93.
What is the Atomic Number of Neon?
Answer
The Atomic Number of Neon is 10.
What is the Atomic Number of Neodymium?
Answer
The Atomic Number of Neodymium is 60.
What is the Atomic Number of Moscovium?
Answer
The Atomic Number of Moscovium is 115.
What is the Atomic Number of Molybdenum?
Answer
The Atomic Number of Molybdenum is 42.
What is the Atomic Number of Mercury?
Answer
The Atomic Number of Mercury is 80.
What is the Atomic Number of Mendelevium?
Answer
The Atomic Number of Mendelevium is 101.
What is the Atomic Number of Meitnerium?
Answer
The Atomic Number of Meitnerium is 109.
What is the Atomic Number of Manganese?
Answer
The Atomic Number of Manganese is 25.
What is the Atomic Number of Magnesium?
Answer
The Atomic Number of Magnesium is 12.
What is the Atomic Number of Lutetium?
Answer
The Atomic Number of Lutetium is 71.
What is the Atomic Number of Livermorium?
Answer
The Atomic Number of Livermorium is 116.
What is the Atomic Number of Lithium?
Answer
The Atomic Number of Lithium is 3.
What is the Atomic Number of Lead?
Answer
The Atomic Number of Lead is 82.
What is the Atomic Number of Lawrencium?
Answer
The Atomic Number of Lawrencium is 103.
What is the Atomic Number of Lanthanum?
Answer
The Atomic Number of Lanthanum is 57.
What is the Atomic Number of Krypton?
Answer
The Atomic Number of Krypton is 36.
What is the Atomic Number of Iron?
Answer
The Atomic Number of Iron is 26.
What is the Atomic Number of Iridium?
Answer
The Atomic Number of Iridium is 77.
What is the Atomic Number of Iodine?
Answer
The Atomic Number of Iodine is 53.
What is the Atomic Number of Indium?
Answer
The Atomic Number of Indium is 49.
What is the Atomic Number of Hydrogen?
Answer
The Atomic Number of Hydrogen is 1.
What is the Atomic Number of Holmium?
Answer
The Atomic Number of Holmium is 67.
What is the Atomic Number of Helium?
Answer
The Atomic Number of Helium is 2.
What is the Atomic Number of Hassium?
Answer
The Atomic Number of Hassium is 108.
What is the Atomic Number of Hafnium?
Answer
The Atomic Number of Hafnium is 72.
What is the Atomic Number of Gold?
Answer
The Atomic Number of Gold is 79.
What is the Atomic Number of Germanium?
Answer
The Atomic Number of Germanium is 32.
What is the Atomic Number of Gallium?
Answer
The Atomic Number of Gallium is 31.
What is the Atomic Number of Gadolinium?
Answer
The Atomic Number of Gadolinium is 64.
What is the Atomic Number of Francium?
Answer
The Atomic Number of Francium is 87.
What is the Atomic Number of Fluorine?
Answer
The Atomic Number of Fluorine is 9.
What is the Atomic Number of Flerovium?
Answer
The Atomic Number of Flerovium is 114.
What is the Atomic Number of Fermium?
Answer
The Atomic Number of Fermium is 100.
What is the Atomic Number of Europium?
Answer
The Atomic Number of Europium is 63.
What is the Atomic Number of Erbium?
Answer
The Atomic Number of Erbium is 68.
What is the Atomic Number of Einsteinium?
Answer
The Atomic Number of Einsteinium is 99.
What is the Atomic Number of Dysprosium?
Answer
The Atomic Number of Dysprosium is 66.
What is the Atomic Number of Dubnium?
Answer
The Atomic Number of Dubnium is 105.
What is the Atomic Number of Darmstadtium?
Answer
The Atomic Number of Darmstadtium is 110.
What is the Atomic Number of Curium?
Answer
The Atomic Number of Curium is 96.
What is the Atomic Number of Copper?
Answer
The Atomic Number of Copper is 29.
What is the Atomic Number of Copernicium?
Answer
The Atomic Number of Copernicium is 112.
What is the Atomic Number of Cobalt?
Answer
The Atomic Number of Cobalt is 27.
What is the Atomic Number of Chromium?
Answer
The Atomic Number of Chromium is 24.
What is the Atomic Number of Chlorine?
Answer
The Atomic Number of Chlorine is 17.
What is the Atomic Number of Cesium?
Answer
The Atomic Number of Cesium is 55.
What is the Atomic Number of Cerium?
Answer
The Atomic Number of Cerium is 58.
What is the Atomic Number of Carbon?
Answer
The Atomic Number of Carbon is 6.
What is the Atomic Number of Californium?
Answer
The Atomic Number of Californium is 98.
What is the Atomic Number of Calcium?
Answer
The Atomic Number of Calcium is 20.
What is the Atomic Number of Cadmium?
Answer
The Atomic Number of Cadmium is 48.
What is the Atomic Number of Bromine?
Answer
The Atomic Number of Bromine is 35.
What is the Atomic Number of Boron?
Answer
The Atomic Number of Boron is 5.
What is the Atomic Number of Bohrium?
Answer
The Atomic Number of Bohrium is 107.
What is the Atomic Number of Bismuth?
Answer
The Atomic Number of Bismuth is 83.
What is the Atomic Number of Beryllium?
Answer
The Atomic Number of Beryllium is 4.
What is the Atomic Number of Berkelium?
Answer
The Atomic Number of Berkelium is 97.
What is the Atomic Number of Barium?
Answer
The Atomic Number of Barium is 56.
What is the Atomic Number of Astatine?
Answer
The Atomic Number of Astatine is 85.
What is the Atomic Number of Arsenic?
Answer
The Atomic Number of Arsenic is 33.
What is the Atomic Number of Argon?
Answer
The Atomic Number of Argon is 18.
What is the Atomic Number of Antimony?
Answer
The Atomic Number of Antimony is 51.
What is the Atomic Number of Americium?
Answer
The Atomic Number of Americium is 95.
What is the Atomic Number of Aluminium?
Answer
The Atomic Number of Aluminium is 13.
What is the Atomic Number of Actinium?
Answer
The Atomic Number of Actinium is 89.