Atomic number is the number which is assigned to every chemical element in the periodic table. It represents the number of protons in the nucleus and therefore it is also called as proton number. It is represented with the symbol Z and the first element in the periodic table is hydrogen as its atomic number is 1.
Atomic number defines the number of protons in the nucleus.
It tells us about the number of electrons in the nucleus of an atom.
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Atomic number is the number which is assigned to every chemical element in the periodic table. It represents the number of protons in the nucleus and therefore it is also called as proton number. It is represented with the symbol Z and the first element in the periodic table is hydrogen as its atomic number is 1.