alleryStart learning →Which property increases across a period and decreases down a group?
AElectronegativity
BMetallic character
CAtomic radius
DNumber of shells
Answer & Solution
Correct answer: A. Electronegativity
1. Across a period, atoms shrink and pull electrons more strongly.
2. So electronegativity rises left to right.
3. Down a group, atoms grow larger and pull less.
4. So electronegativity falls top to bottom.
5. So electronegativity fits the described trend.
_Source: Selina Concise Chemistry ICSE Class 9, Ch 5 'The Periodic Table'_
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