| 1) When was Cromium discovered? | |
| 2) What element has atomic number 104? | |
| 3) What element has the atomic symbol Sn? | |
| 4) Which element has the highest atomic weight? | |
| 5) Which element has the lowest atomic weight? | |
| 6) What element has atomic number 19? | |
| 7) How many elements have been known since ancient times? | |
| 8) Which element has an atomic weight of 126.9045? | |
| 9) How long did it take you to find the answers? |
| List of Elements | |||||||||
| Name | Symbol | Atom no. | Weight | Discovery | Name | Symbol | Atom no. | Weight | Discovery |
| Actinium | Ac | 89 | 227 | 1899 | Meitnerium | Mt | 109 | 268 | 1982 |
| Aluminum | Al | 13 | 26.9815 | 1825 | Mendelevium | Md | 101 | 258 | 1955 |
| Americium | Am | 95 | 243 | 1944 | Mercury | Hg | 80 | 200.59 | ancient |
| Antimony | Sb | 51 | 121.76 | ancient | Molybdenum | Mo | 42 | 95.94 | 1781 |
| Argon | Ar | 18 | 39.948 | 1894 | Neodymium | Nd | 60 | 144.24 | 1885 |
| Arsenic | As | 33 | 74.9216 | ancient | Neon | Ne | 10 | 20.1797 | 1898 |
| Astatine | At | 85 | 210 | 1940 | Neptunium | Np | 93 | 237 | 1940 |
| Barium | Ba | 56 | 137.327 | 1808 | Nickel | Ni | 28 | 58.6934 | 1751 |
| Berkelium | Bk | 97 | 247 | 1949 | Niobium | Nb | 41 | 92.9064 | 1801 |
| Beryllium | Be | 4 | 9.0122 | 1797 | Nitrogen | N | 7 | 14.0067 | 1772 |
| Bismuth | Bi | 83 | 208.9804 | ancient | Nobelium | No | 102 | 259 | 1958 |
| Bohrium | Bh | 107 | 264 | 1981 | Osmium | Os | 76 | 190.23 | 1803 |
| Boron | B | 5 | 10.811 | 1808 | Oxygen | O | 8 | 15.9994 | 1774 |
| Bromine | Br | 35 | 79.904 | 1826 | Palladium | Pd | 46 | 106.42 | 1803 |
| Cadmium | Cd | 48 | 112.411 | 1817 | Phosphorus | P | 15 | 30.9738 | 1669 |
| Calcium | Ca | 20 | 40.078 | 1808 | Platinum | Pt | 78 | 195.078 | 1735 |
| Californium | Cf | 98 | 251 | 1950 | Plutonium | Pu | 94 | 244 | 1940 |
| Carbon | C | 6 | 12.0107 | ancient | Polonium | Po | 84 | 209 | 1898 |
| Cerium | Ce | 58 | 140.116 | 1803 | Potassium | K | 19 | 39.0983 | 1807 |
| Cesium | Cs | 55 | 132.9055 | 1860 | Praseodymium | Pr | 59 | 140.9077 | 1885 |
| Chlorine | Cl | 17 | 35.453 | 1774 | Promethium | Pm | 61 | 145 | 1945 |
| Chromium | Cr | 24 | 51.9961 | 1797 | Protactinium | Pa | 91 | 231.0359 | 1913 |
| Cobalt | Co | 27 | 58.9332 | 1735 | Radium | Ra | 88 | 226 | 1898 |
| Copper | Cu | 29 | 63.546 | ancient | Radon | Rn | 86 | 222 | 1900 |
| Curium | Cm | 96 | 247 | 1944 | Rhenium | Re | 75 | 186.207 | 1925 |
| Dubnium | Db | 105 | 262 | 1967 | Rhodium | Rh | 45 | 102.9055 | 1803 |
| Dysprosium | Dy | 66 | 162.5 | 1886 | Rubidium | Rb | 37 | 85.4678 | 1861 |
| Einsteinium | Es | 99 | 252 | 1952 | Ruthenium | Ru | 44 | 101.07 | 1844 |
| Erbium | Er | 68 | 167.259 | 1842 | Rutherfordium | Rf | 104 | 261 | 1964 |
| Europium | Eu | 63 | 151.964 | 1901 | Samarium | Sm | 62 | 150.36 | 1879 |
| Fermium | Fm | 100 | 257 | 1952 | Scandium | Sc | 21 | 44.9559 | 1879 |
| Fluorine | F | 9 | 18.9984 | 1886 | Seaborgium | Sg | 106 | 266 | 1974 |
| Francium | Fr | 87 | 223 | 1939 | Selenium | Se | 34 | 78.96 | 1817 |
| Gadolinium | Gd | 64 | 157.25 | 1880 | Silicon | Si | 14 | 28.0855 | 1824 |
| Gallium | Ga | 31 | 69.723 | 1875 | Silver | Ag | 47 | 107.8682 | ancient |
| Germanium | Ge | 32 | 72.64 | 1886 | Sodium | Na | 11 | 22.9897 | 1807 |
| Gold | Au | 79 | 196.9665 | ancient | Strontium | Sr | 38 | 87.62 | 1790 |
| Hafnium | Hf | 72 | 178.49 | 1923 | Sulfur | S | 16 | 32.065 | ancient |
| Hassium | Hs | 108 | 277 | 1984 | Tantalum | Ta | 73 | 180.9479 | 1802 |
| Helium | He | 2 | 4.0026 | 1895 | Technetium | Tc | 43 | 98 | 1937 |
| Holmium | Ho | 67 | 164.9303 | 1867 | Tellurium | Te | 52 | 127.6 | 1783 |
| Hydrogen | H | 1 | 1.0079 | 1776 | Terbium | Tb | 65 | 158.9253 | 1843 |
| Indium | In | 49 | 114.818 | 1863 | Thallium | Tl | 81 | 204.3833 | 1861 |
| Iodine | I | 53 | 126.9045 | 1811 | Thorium | Th | 90 | 232.0381 | 1829 |
| Iridium | Ir | 77 | 192.217 | 1803 | Thulium | Tm | 69 | 168.9342 | 1879 |
| Iron | Fe | 26 | 55.845 | ancient | Tin | Sn | 50 | 118.71 | ancient |
| Krypton | Kr | 36 | 83.8 | 1898 | Titanium | Ti | 22 | 47.867 | 1791 |
| Lanthanum | La | 57 | 138.9055 | 1839 | Tungsten | W | 74 | 183.84 | 1783 |
| Lawrencium | Lr | 103 | 262 | 1961 | Uranium | U | 92 | 238.0289 | 1789 |
| Lead | Pb | 82 | 207.2 | ancient | Vanadium | V | 23 | 50.9415 | 1830 |
| Lithium | Li | 3 | 6.941 | 1817 | Xenon | Xe | 54 | 131.293 | 1898 |
| Lutetium | Lu | 71 | 174.967 | 1907 | Ytterbium | Yb | 70 | 173.04 | 1878 |
| Magnesium | Mg | 12 | 24.305 | 1755 | Yttrium | Y | 39 | 88.9059 | 1794 |
| Manganese | Mn | 25 | 54.938 | 1774 | Zinc | Zn | 30 | 65.39 | ancient |
| Zirconium | Zr | 40 | 91.224 | 1789 | |||||