Which element has atoms with valence electrons in a higher energy level than those of calcium (Ca)? (1 point) Responses oxygen (O) oxygen (O) bromine (Br) bromine (Br) cesium (Cs) cesium (Cs) lithium (Li)

Answer 1

Calcium (Ca) has its valence electrons in the 4th energy level (specifically in the 4s subshell, as its electron configuration is [Ar] 4s²).

To determine which element has valence electrons in a higher energy level, we can look at the options provided:

• Oxygen (O): Has valence electrons in the 2nd energy level (electron configuration: 1s² 2s² 2p⁴).
• Bromine (Br): Has valence electrons in the 4th energy level (electron configuration: [Ar] 4s² 3d¹⁰ 4p⁵).
• Cesium (Cs): Has valence electrons in the 6th energy level (electron configuration: [Xe] 6s¹).
• Lithium (Li): Has valence electrons in the 2nd energy level (electron configuration: 1s² 2s¹).

Among these, Cesium (Cs) has valence electrons in the 6th energy level, which is higher than the 4th energy level of Calcium.

Therefore, the correct response is cesium (Cs).