The Periodic Table, devised and first published by the physicist Mendeleev, lists elements horizontally in order of their atomic number, and vertically in order of the number of electrons around the nucleus.
For each element, the periodic table usually gives the atomic number (number of protons), the symbol, the atomic mass (number of protons and neutrons) and the name of the element. For example, the element hydrogen has the atomic number 1, is represented by the symbol H, its atomic mass is 1.008 and its name is hydrogen. The periodic table below is a simplified representation and only gives the atomic number and the symbol.
For each element, the periodic table usually gives the atomic number (number of protons), the symbol, the atomic mass (number of protons and neutrons) and the name of the element. For example, the element hydrogen has the atomic number 1, is represented by the symbol H, its atomic mass is 1.008 and its name is hydrogen. The periodic table below is a simplified representation and only gives the atomic number and the symbol.
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