Question

The electron configuration for an element is 1s2 2s2 2p6 3s2 3p6. What is the atomic number of the element? *
A. 3
B. 11
C. 18
D. 22

Answer 1

Explanation:

Electronic configuration =

1s² 2s² 2p⁶ 3s² 3p⁶

1. Atomic number = 18
2. Element = Argon
3. Symbol = Ar
4. Group = 18
5. period = 3

Therefore,

Option C is correct✔