Question

question 7 (1 point)
what is the highest energy level (valence shell) an electron will occupy in ca?
a 4s^1
b 4p^2
c 4p^1
d 4s^2

Explanation:

Calcium (Ca) has an atomic number of 20. Its electron - configuration is 1s²2s²2p⁶3s²3p⁶4s². The outermost shell (valence shell) is the 4th energy level, and the electrons in the valence shell are in the 4s orbital with 2 electrons.

Answer:

D. 4s²