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Question

The element having 18 electrons in its outermost shell is :

A
28Ni
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B
46Pd
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C
29Cu
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D
None of these
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Solution

The correct option is A 46Pd
The element having 18 electrons in its outer most shell is palladium (atomic number 46).
1s22s22p63s23p63d104s24p64d10

In the above configuration, there are 18 electrons in the 4th outer shell (2+6+10=18)

Hence option B is correct.

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