Question

Element A has seven valence electrons. How does its reactivity compare to that of element B, which has four valence electrons?

Answer 1

Element A is more reactive. Take Fluorine for example. Since its in group 17, it needs one more electron to have an octet. Compared with carbon, group 14 with 4 valence electrons, Fluorine wants and is able to get an electron much more easily.

Answer 2

ELEMENT A is more reactive