list of elements with names from 1 to 20 AND VALENCY
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H.he.li.be.b.c.n.o.f.ne.na.mg.al.si.p.s.cl.ar.k.ca
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H - 1
He - 0
Li - 1
Be - 2
B - 3
C - 4
N - 3
O - 2
F - 1
Ne - 0
Na - 1
Mg - 2
Al - 3
Si - 4
P - 3
S - 2
Cl - 1
Ar - 0
K - 1
Ca - 2
He - 0
Li - 1
Be - 2
B - 3
C - 4
N - 3
O - 2
F - 1
Ne - 0
Na - 1
Mg - 2
Al - 3
Si - 4
P - 3
S - 2
Cl - 1
Ar - 0
K - 1
Ca - 2
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