Question

1. choose all that apply. which two sublevels does calcium have? d p s f 4. choose the best answer. what period is calcium in? 40 2 20 4

Explanation:

For question 3: Calcium has an atomic number of 20, with electron configuration $1s^22s^22p^63s^23p^64s^2$. The occupied sublevels are s and p.
For question 4: The highest principal quantum number of calcium's occupied orbitals is 4, so it is in period 4.

Answer:

1. s, p
2. 4