Question

how many energy levels are present in the above electron configuration?1s² 2s² 2p⁴

Explanation:

Step1: Identify energy - level numbers

In electron configuration, the number before the orbital type (s, p, etc.) represents the energy level. Here we have 1 in 1s and 2 in 2s and 2p.

Step2: Count distinct energy - level numbers

The distinct energy - level numbers are 1 and 2. So there are 2 energy levels.

Answer:

2