Need answer asap ! which of these elements has four valence electrons? (a). hafnium (hf) (b.) radon (rn) (c.) silicon (si) (d.) sulfur (s)

Anumber of conditions are required for a population to be in hardy-weinberg equilibrium. which of the following are correct descriptions of the conditions that must be met? check all that apply. a. no mutations b. random mating c. small population d. migration or gene flow e. occurrence of mutations f. no natural selection