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Question
The electronic configuration of the atom of an element X is 2, 8, 4. In modern periodic table, the element X is places in :
(a) 2nd group
(b) 4th group
(c) 14th group
(d) 8th group
Solution
(c) 14th group
Group number = 10 + 4
= 14
Hence, the element X is placed in the 14th group.
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