Question

indicate the total number of 4d electrons in ba (z=56).

Explanation:

Step1: Determine electron configuration of Ba

Barium (Ba) has an atomic number \( Z = 56 \). The electron configuration follows the Aufbau principle. The electron configuration of Ba is \( 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^{10} 4p^6 5s^2 4d^{10} 5p^6 6s^2 \).

Step2: Identify 4d electrons

Looking at the electron configuration, the \( 4d \) subshell has the configuration \( 4d^{10} \), which means there are 10 electrons in the \( 4d \) subshell.

Answer:

10