Question
Which one has the smaller size?
K(19) or Na(1); B(5) or C(6)
K(19) or Na(1); B(5) or C(6)
✓
Answer
- Na has the smaller size than K because number of shells increases down a group. Hence K is bigger and Na is smaller.
- C has smaller size than B because effective nuclear charge increases from left to right in a period. Due to this effective nuclear charge, the electronegativity increases. Hence C has smaller size.
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