7. Valencies of some elements

Match the elements of the atoms with their valency:
Answer variants:
\(Ar\)
\(O\)
\(B\)
\(H\)
 
S.No.
Valency
Elements
1.
\(0\)
2.
\(1\)
3.
\(2\)
4.
\(3\)
 
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