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BITSAT 2019 Solved Question Paper
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© examsnet.com
Question : 40
Total: 150
The nuclei of which one of the following pairs of nuclei are isotones ?
34
S
e
74
,
31
G
a
71
38
S
r
84
,
38
S
r
86
42
M
o
92
,
40
Z
r
92
20
C
a
40
,
16
S
32
Validate
Solution:
(a) Isotones means equal number of neutrons
i.e., (A - Z) = 74 - 34 = 71 - 31 = 40
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