Calcium has 20 electrons. These occupy K, L, M and N shells. Which shell or shells are incomplete?
A. L, M, N shells
B. M, N shells
C. N shell
D. K, M, L, N shells
Answer:C
Calcium has 20 electrons. These occupy K, L, M and N shells. Which shell or shells are incomplete?
A. L, M, N shells B. M, N shells C. N shell D. K, M, L, N shells