ICSE Class 10 Physics 2015 Solved Paper
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An atomic nucleus A
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Question : 72
Total: 74
The nucleus A B B
Solution:
Given : Composition of atomic nucleus
A = 84
Mass no. of A = 84 + 128
= 212
Atomic no. ofA = 84
The nucleus A emits an alpha particle, the mass number decreases by 4 and the atomic no. decreases by 2 .
84 212 A
82 208 B
No. of protons inB = 82
No. of neutrons in B = 208 − 82
= 126 .
Atomic no. of
The nucleus A emits an alpha particle, the mass number decreases by 4 and the atomic no. decreases by 2 .
No. of protons in
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