Question

What is the subshell in which the last electron of the first element in the 6th period enters?​

Answer 1

The first element in 6th period is Cs(55)

the subshell in which it is entering is 6s as it lies in 6th period and  is a s- block element

PLS MARK AS BRAINLEST

Answer 2

Answer:

The subshell is 's' subshell

Explanation:

The first element in the sixth period is Caesium (Cs). Its atomic no. is 55.

Nd the electronic configuration according to the Aufbou Principle is as given below:

1s²,  2s²,  2p⁶,  3s²,  3p⁶,  4s²,  3d¹⁰,  4p⁶,  5s²,  4d¹⁰,  5p⁶,  6s¹.

And the last electron is in the s  subshell.