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Chemistry
Chemistry
Problem
Which of the following pairs of molecule can exist ? a.
H
e
2
He_2
H
e
2
and
B
e
2
Be_2
B
e
2
b.
O
2
2
−
O_2^{2-}
O
2
2
−
and
N
a
2
Na_2
N
a
2
c.
O
2
2
−
O_2^{2-}
O
2
2
−
and
H
2
−
H_2^-
H
2
−
d.
B
e
2
Be_2
B
e
2
and
M
g
2
Mg_2
M
g
2
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