We are being asked which of the given elements have very similar chemical properties. This is similar to the question “Which of the given elements belong to the same group?”.
To do this, we can always rely on our periodic table of elements to help us in determining which group our given elements belong to.
In which set elements would all members be expected to have very similar chemical properties?
a. O, S, Se
b. N, O, F
c. Na, Mg, K
d. S, Se, Si
e. Ne, Na, Mg