How does the size of atoms (atomic size) generally vary in going from left to right in a period of the periodic table ? Why does it vary this way ?

As we know that in modern periodic table the atomic number increases as we move from left to right in a period which means that the no. of protons and electrons also increases .When the amount of protons and electrons increases in the elements then the positive charge also increases in the nucleus of the elements, so nucleus pulls electrons and the size of the atom decreases.


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