All you need to do the cross the charges and put it as suffixes.
D+2 + E-1 ----> DE2
answer is C
1) period
2) the answer is D) I because they are in the same column
3) B)Ge because they are in the same column
4) A) Al because they are in the same column (share same characteristics)
5) D) they have the same number of valence electrons
6) D) nonmetals
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Alkali Metals have 2 valence electrons
its 640 because 150 goes into 900 6.4 times do you multiply 6.4 and 100 which is 640.
