Question

in period 5, there are 18 elements. what sublevel(s)/orbitals is(are) being filled? select all that apply
□ s
□ p
□ d
□ f

Explanation:

In the periodic table, period 5 elements fill orbitals. The s sublevel (2 electrons), d sublevel (10 electrons), and p sublevel (6 electrons) sum to 18 (2 + 10 + 6 = 18). The f sublevel is filled in inner periods (like lanthanides/actinides, not period 5). So s, d, p are filled.

Answer:

A. s, B. p, C. d