Question

which element has atoms with valence electrons in a higher energy level than those of calcium (ca)? (1 point)
cesium (cs)
oxygen (o)
bromine (br)
lithium (li)

Explanation:

Calcium is in the fourth - period. Valence electrons of elements in higher periods have higher energy levels. Cesium is in the sixth - period, while lithium is in the second, bromine in the fourth, and oxygen in the second. So cesium's valence electrons are in a higher energy level than calcium's.

Answer:

Cesium (Cs)