2. Valency of elements or atoms

Match the atom or element with their valency.
 
S.No.
Valency
Atom
1.
\(0\)
2.
\(1\)
3.
\(2\)
4.
\(3\)
Answer variants:
\(Li\)
\(B\)
\(He\)
\(O\)
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