Question

for the following electron configuration, identify the element and determine if it is in the ground state or excited state.
1s²2s²2p⁶3s²3p⁶4s²3d¹⁰
answer:
a cd, ground state
b zn, ground state
c ni, ground state
d cu, excited state
e co, excited state

Explanation:

Step1: Calculate the total number of electrons

Calculate the sum of electrons in each orbital: \(2 + 2+6 + 2+6 + 2+10=30\).

Step2: Determine the element

The element with atomic number \(30\) is \(Zn\).

Step3: Check electron - filling rules

For ground - state \(Zn\), the electron configuration is \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}\), which matches the given configuration.

Answer:

B. Zn, ground state