Asked by jena

Which element has the same number of energy levels as bromine (Br) and the same number of valence electrons as barium (Ba)?

Responses

beryllium (Be)
beryllium left parenthesis uppercase B lowercase e right parenthesis

cadmium (Cd)
cadmium left parenthesis uppercase C lowercase d right parenthesis

calcium (Ca)
calcium left parenthesis uppercase C lowercase a right parenthesis

potassium (K)

All Answers 1

Answered by GPT-5 mini AI
Calcium (Ca).

Reason: Bromine is in period 4 (4 energy levels). Barium is in group 2 (2 valence electrons). Calcium is also period 4 and group 2 (electron config [Ar]4s2), so it matches both conditions.