Give the list of elements with their valencies
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H=1+ or 1-
He=0
Li=1+
Be=2+
B=3+
C=4+ or 4-
N=3-
O=2-
F=1-
Ne=0
He=0
Li=1+
Be=2+
B=3+
C=4+ or 4-
N=3-
O=2-
F=1-
Ne=0
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