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Na (Atomic number: 11; Electronic configuration: 1s2, 2s2, 2p6, 3s1).

Na has 11 electrons distributed in electron shells. This negative charge provided by electrons is countered by 11 protons present in nucleus of Na. The electron in 3s1 is losely held by the positively charged nucleus. When Na loses its outermost electron (3s1), there is an imbalance in the total number of positive charge (provided by protons) and negative charge (provided by electrons). With an increase in positive charge in the ion, the electron charge around the nucleus is drawn closer to it. As a result of this the atomic radius of the Na ion decreases and hence its radius is smaller than that of Na atom.

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13y ago
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13y ago

The sodium ion has a positive charge and is formed from a neutral atom by losing its only valence shell electron, thereby giving it a smaller size than its corresponding neutral atom. The chloride ion has a negative charge and is formed from its neutral atom by acquiring an additional electron, thereby somewhat increasing its size.

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Q: Why Na positive ion is smaller than a Na atom in size?
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