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Chemistry
Chemistry
Problem
For singly ionized helium (He
+
^{+}
+
,
Z
=
2
Z=2
Z
=
2
), the electron in the
n
=
2
n=2
n
=
2
orbit has radius
r
2
,
H
e
+
r_{2,\mathrm{He}^{+}}
r
2
,
He
+
. Hydrogen’s ground-state orbital radius is
r
1
,
H
r_{1,\mathrm{H}}
r
1
,
H
. What is the value of the ratio
r
2
,
H
e
+
r
1
,
H
\dfrac{r_{2,\mathrm{He}^{+}}}{r_{1,\mathrm{H}}}
r
1
,
H
r
2
,
He
+
? a)
4.0
4.0
4.0
b)
0.50
0.50
0.50
c)
2.0
2.0
2.0
d)
1.0
1.0
1.0
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