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An element X belongs to fourth period ...

An element X belongs to fourth period and fifteen group of the periodic table . Which of the following statements is true ?

A

It has a completely filled s-orbital and a partially filled d-orbital

B

It has completely filled s and p-orbitals and a partially filled d-orbital

C

It has completely filled s and p-orbitals and a half filled d-orbitals

D

It has a half filled p-orbital and completely filled s and d-orbitals

Text Solution

Verified by Experts

The correct Answer is:
D
It.s Arsenic
`As_((33)) : [Ar]4s^2 3d^10 4p^3`.
Trick :
Period `rArr ` principal quantum number 4
Group `rArr ` number of electrons in fourth shell
`i.e., 4s^2 4p^3 rArr 2 + 3 rArr 5e^(-)`
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