Question 3
Atomic StructureWhich of the following is the electronic configuration of sodium? (Atomic number of Na = 11)
- A.1s2 2s2 2p6 3s2
- B.1s2 2s2 2p6 3s2 3p1
- C.1s2 2s2 2p6 3s1
- D.1s2 2s2 2p6 3s0
- E.1s2 2s2 2p6 3s2 3p6 4s1
Show the answer and explanation
Answer: C (1s2 2s2 2p6 3s1)
Explanation
Sodium has 11 electrons: 2 fill 1s, 2 fill 2s, 6 fill 2p and the last one goes into 3s, giving 1s2 2s2 2p6 3s1.