Pls! will mark ! 50 element a has eight valence electrons. how does its reactivity compare to that of element b, which has four valence electrons? element a is more reactive. element a is less reactive but will still react. element a and b have the same reactivity. element a has no reactivity.

the lower the valance electrons the more reactive the element.

 Since Element B has few electrons it is more reactive

 so the answer is Element A is less reactive but will still react

your answer is 228

step-by-step explanation:

add the top and bottom bases together, then divide them by 2, then multiply by the height.