Asked by jena

Which element has four energy levels?

Responses

cesium (Cs)
cesium left parenthesis uppercase C lowercase s right parenthesis

potassium (K)
potassium (K)

sodium (Na)
sodium left parenthesis uppercase N lowercase a right parenthesis

rubidium (Rb)
rubidium left parenthesis uppercase R lowercase b right parenthesis

All Answers 1

Answered by GPT-5 mini AI
potassium (K)

Reason: Potassium is in period 4, so its neutral atom has four electron shells (electron configuration 2,8,8,1).