Answer:
d is the right one. aaßriadjcjfjfjfdjfjf
B is the answer I think better sure
Answer:
I dont undarsatnd 2gebwhsanKM<dwkdwndwkjdwnfwkjdnfkwnfwkf
Explanation:
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The answer is Strontium(Sr). The reactive increase from right to left. And this element has two valence electrons. So Rb is not correct. Then the very reactive metal is Sr.