Fluorine (f2) is a(n) because the valence electrons are shared equally between the two fluorine atoms.

cytokinesis is the splitting of a cell membrane to form 2 identical daughter cells. it's similar to mitosis as both cells have identical copies of dna and cytokinesis is a step in the mitotic cycle.

oxygen, selenium, tellurium, and polonium.

they're all from the same group as sulfur (group 16).