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In the modern periodic table, elements of which group have a complete outermost shell?
A18th group
B15th group
C16th group
D17th group
Answer & Solution
Correct answer: A. 18th group
1. A complete outer shell means a stable octet (or duplet for helium).
2. The noble gases have fully filled outer shells.
3. The noble gases form Group 18 of the periodic table.
_Source: RRB Group D CEN-02/2018 PYQ, Q.9._
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