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Chemistry
Chemistry
Problem
The Balmer
α
\alpha
α
line (
n
i
=
3
→
n
f
=
2
n_i=3\rightarrow n_f=2
n
i
=
3
→
n
f
=
2
) appears at
656
nm
656\,\text{nm}
656
nm
in hydrogen. The same transition in a singly ionised, hydrogen-like atom of unknown atomic number
Z
Z
Z
is observed at
72.9
nm
72.9\,\text{nm}
72.9
nm
. The value of
Z
Z
Z
for this ion is a)
Z
=
9
Z = 9
Z
=
9
b)
Z
=
2
Z = 2
Z
=
2
c)
Z
=
3
Z = 3
Z
=
3
d)
Z
=
4
Z = 4
Z
=
4
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