alleryIn the Modern Periodic Table, the position of which element is anomalous as it can be placed in either group 1 or group 17?
AHelium
BLithium
CHydrogen
DBeryllium
Answer & Solution
Correct answer: C. Hydrogen
1. Hydrogen has one electron, like group 1 alkali metals.
2. It also needs one electron to complete its shell, like group 17 halogens.
3. So hydrogen's position is anomalous.
_Source: RRB Group D CEN-02/2018 PYQ, Q.15._
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