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Elements placed in the same group of the modern periodic table have the same number of:
ANeutrons
BElectron shells
CValence electrons
DProtons
Answer & Solution
Correct answer: C. Valence electrons
1. The group is decided by the outermost-shell configuration.
2. All group-1 (alkali metal) atoms have 1 valence electron; group-17 (halogens) have 7.
3. So members of one group share the same number of valence electrons.
4. Rule out B: down a group the number of shells increases, so it differs.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 2 "Periodic Classification of Elements", p.31_
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