Why the size of atoms decreases in a period? - Home of Knowledge

Why the size of atoms decreases in a period?

Why the size of atoms decreases in a period?

Answer: The size of atoms in a period from left to right decreases due to addition of protons in the nucleus that results in the increase of effective nuclear charge. The addition of electrons in the same shell is also a main factor responsible for the decrease of size of atoms. As a result of these two forces, i,e increase in effective nuclear charge and addition of electrons in the same shells leads to contraction or decrease in size of the atoms.

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