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H
2.2
Li
1.0
Na
0.9
K
0.8
Be
1.6
Mg
1.3
B
2.0
Al
C
2.5
Si
1.9
N
3.0
P
O
3.4
S
2.6
F
4.0
Cl
3.2
Br
I
2.7