Which of the following elements contains a total of 10 "s" electrons?

Question

Quizplus · Accepted Answer

Sr (Strontium) has an electron configuration ending in 5s^2, indicating it has 2 s electrons in its outermost shell, but across all its shells, it totals 10 s electrons (2 in 1s, 2 in 2s, 2 in 3s, 2 in 4s, and 2 in 5s). Cs (Cesium) also has a total of 10 s electrons across its shells (2 in 1s, 2 in 2s, 2 in 3s, 2 in 4s, and 2 in 5s, with its valence electron in 6s^1). Sb (Antimony) does not have a total of 10 s electrons in its electron configuration. Therefore, more than one element listed (Sr and Cs) contains a total of 10 "s" electrons.

Which of the Following Elements Contains a Total of 10