29. (a) An atomic nucleus A is composed of 84 protons
and 128 neutrons. The nucleus A emits an
Q-particle and is transformed into a nucleus B.
What is the composition of B? 2 0 13
(b) The nucleus B emits a B-particle and is
transformed into a nucleus C. What is the
composition of C ?
(c) What is the mass number of the nucleus A ?
(d) Does the composition of nucleus C change if it
emits the y radiation ?
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Explanation: Given: Composition of atomic nucleus A=84 protons and 128 neutrons.
Mass noumber of A=84+128=212
Atomic number of A=84
The nucleus A emits an alpha particle, the mass number decreases by 4 and the atomic number decreases by 2.
84
212
A
−α
82
208
B
Number of protons in B=82
Number of neutrons in B=208−82=126
(ii)
82
208
B
−β
83
208
C
Number of protons in C=83
Number of neutrons in C=208−83=125
(iii) The composition of nucleus C does not change if it emits gamma radiations.
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