The answer is •c•
Hope this is correct I tried
<span>Ca has 2 valence electrons and F has 7, they would end up having to share electrons but Ca or F has to keep one because in total there are 9 valence elections and only 8 are needed to make this pair "happy". that's all i can provide. i hope it helped some</span>
K + S = K2S
Potassium reacts with sulfur to produce potassium sulfide
I'm not sure, but maybe burning point...
