Question

q 21 what is the correct electron configuration for chlorine? 1s² 2s² 2p⁶ 3s² 3p⁴ 1s² 2s² 2p⁶ 3s² 3p⁵ 1s² 2s² 2p³ 3s² 3p⁵ 1s² 2s² 2p⁶ 3s² 3p³

Explanation:

Chlorine has an atomic number of 17. Following the Aufbau principle, electrons fill orbitals in order of increasing energy. The first - shell (n = 1) has 1s orbital which can hold 2 electrons, the second - shell (n = 2) has 2s (2 electrons) and 2p (6 electrons) orbitals, and the third - shell (n = 3) has 3s (2 electrons) and 3p (5 electrons) orbitals for chlorine to complete its 17 - electron configuration.

Answer:

1s² 2s² 2p⁶ 3s² 3p⁵