The atomic number is always equal to the number of protons. It will be equal to the number of elections also if the atom has a neutral charge.
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Each shell can contain only a fixed number of electrons: The first shell can hold up to two electrons, the second shell can hold up to eight (2 + 6) electrons, the third shell can hold up to 18 (2 + 6 + 10) and so on. Some points will be nice
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refer to periodic table for explanation
