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AIEEE 2003 Chemistry Solved Paper
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© examsnet.com
Question : 5
Total: 76
Which one of the following groupings represents a collection of isoelectronic species? (At. nos. :
Cs
:
55
,
Br
:
35
)
N
3
−
,
F
,
Na
+
Be
,
Al
3
+
,
Cl
−
Ca
2
+
,
Cs
+
,
Br
Na
+
,
Ca
2
+
,
Mg
2
+
Validate
Solution:
Isoelectronic means those species whose electron number are same.
Species
Atomic Number
Electron Number
N
3
−
7
7
+
3
=
10
F
−
9
9
+
1
=
10
Na
+
11
11
−
1
=
10
Be
4
4
Al
3
+
13
13
−
3
=
10
Cl
−
17
17
+
1
=
18
Ca
2
+
20
20
−
2
=
18
Cs
+
55
55
−
1
=
54
Br
35
35
Mg
2
+
12
12
−
2
=
10
∴
N
3
−
,
F
,
Na
+
© examsnet.com
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