Question

in which set of elements would all members be expected to have very similar chemical properties?
a s, se, si
b o, s, se
c n, o, f
d na, mg, k

Explanation:

Elements in the same group of the periodic table have similar chemical properties. Oxygen (O), sulfur (S), and selenium (Se) are all in Group 16. S and Se are in the same group as O and have the same number of valence - electrons, leading to similar chemical behavior. In option A, S and Se are in Group 16 but Si is in Group 14. In option C, N, O, and F are in adjacent groups (Group 15, 16, and 17 respectively). In option D, Na and K are in Group 1 but Mg is in Group 2.

Answer:

B. O, S, Se