If an atom has electronic configuration 1s22s22p63s23p63d34s2, it will be placed in:
A
second group
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B
third group
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C
fifth group
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D
sixth group
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Solution
The correct option is C fifth group The outermost shell and one shell prior to it in d subshell, has total 5 electron so it will be placed in fifth group in transition element or 'd' block of periodic table.