Question

indicate the total number of 3d electrons in s (z=16).

Explanation:

Step1: Determine electron configuration of S

Sulfur (S) has an atomic number \( Z = 16 \). The electron configuration follows the Aufbau principle. The order of filling orbitals is \( 1s, 2s, 2p, 3s, 3p, 4s, 3d, \dots \). For \( Z = 16 \), the electron configuration is \( 1s^2 2s^2 2p^6 3s^2 3p^4 \).

Step2: Check 3d orbital electrons

In the electron configuration of S, the \( 3d \) orbital is not yet filled because the filling order prioritizes lower energy orbitals. The electrons fill \( 3s \) and \( 3p \) before \( 3d \) (and \( 4s \) before \( 3d \) as well). So, there are no electrons in the \( 3d \) orbital for S.

Answer:

0