Question

Which elements symbol could replace the question mark in the diagram?

Answer 1

Those dots represent the valence electrons of the element. The only elements with 6 valence electrons are oxygen, sulfur,  selenium, and..... so on. SO the answer to your question is B, tellurium(Te).

Answer 2

Answer;

-Tellurium

Explanation;

The oxygen family consists of the elements found in Group 16 of the periodic table and is considered among the main group elements. It consists of the elements oxygen, sulfur, selenium, tellurium and polonium.

All group 16 elements have six valence electrons and are very reactive. therefore the appropriate answer is Tellurium.