what is atomic number?
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the number of protons in the nucleus of an atom, which is characteristic of a chemical element and determines its place in the periodic table.
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The atomic number or proton number(symbol Z) of a chemical element is the number of protons found in the nucleus of an atom. It is identical to the charge number of the nucleus. The atomic number uniquely identifies a chemical element. In an uncharged atom, the atomic number is also equal to the number of electrons.
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The number of protons in the atom of any element is known as its atomic number. For example, a hydrogen atom has just one proton in it. Hence, the atomic number of hydrogen is 1. Likewise, a boron atom contains five protons in it. Hence, it's atomic number is 5.
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