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An element has 18 electrons in the outer most shell. The element is

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Transition metal
Rare earth metal
Alkaline earth metal
Alkali metal

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detailed solution

Correct option is A

The element having 18 electrons in its outer most shell is palladium (atomic number 46). 

Electronic configuration is 1s22s22p63s23p63d104s24p64d10 (18 electrons in the 4th outer shell)

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