Which of the above elements would you expect to be in group 16 of the Periodic Table?

Q. Consider the following elements

20Ca, 8Or 18Ar, 16S, 4Be, 2He

Which of the above elements would you expect to be in group 16 of the Periodic Table?

A.            20Ca and 16S

B.            20Ca and 😯

C.            18Ar and 16S

D.            😯 and 16S

Answer: 😯 and 16S