alleryElements that have the same number of electron-occupied shells belong to the same:
AGroup
BPeriod
CBlock only
DTriad
Answer & Solution
Correct answer: B. Period
1. Within a period the number of occupied shells stays constant.
2. For example, all period-2 elements (Li to Ne) use only the K and L shells.
3. So the number of shells fixes the period of an element.
4. Rule out A: a group shares valence-electron count, but shell number rises down it.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 2 "Periodic Classification of Elements", p.33_
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