Does sodium has atomic size greater than that of argon or argon has a larger atomic size than sodium please explain.
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The atomic size of Na (Sodium is larger than that of Ar (Argon) because -
As we move from left to right across a period, the number of electrons in same shells increases.
Similarly, there is an increase in the number of Protons also increases.
Thus the force of attraction between the nucleus and the outermost shell increases. It leads to a decrease in size.
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