Chemistry

Problem

Which of the following is the incorrect match for atom of element ? a.

[\text{Ar}]3d^5 4s^1 \rightarrow 4^{\text{th}}

period,

6^{\text{th}}

group b.

[\text{Kr}]4d^{10} \rightarrow 5^{\text{th}}

period,

12^{\text{th}}

group c.

[\text{Rn}]6d^2 7s^2 \rightarrow 7^{\text{th}}

period,

3^{\text{rd}}

group d.

[\text{Xe}]4f^{14} 5d^2 6s^2 \rightarrow 6^{\text{th}}

period,

4^{\text{th}}

group