Periodic Classification of Elements — Science STD 10 — Question
CBSE BoardEnglish MediumSTD 10SciencePeriodic Classification of Elements1 Mark
Question
Which has smaller size, Na or $Na ^{+}$?
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Answer
According to the electronic configuration of sodium( Na ), it has 1 valence electron( $2,8,1$.So it loses one electron to form a cation and becomes sodium cation $\left( Na ^{+}\right)$.As it loses one electron, the outermost shell has 0 electrons (i.e it gets eliminated) and $Na +$ has only 2 shells. Hence, it lost one of its shell, the sodium ion is smaller than the sodium atom.
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