Question

(C) An atomic nucleus A is composed of 84 protons and 128 neutrons. The nucleus
A emits an alpha particle and is transformed into a nucleus B.
(i) What is the composition of B?
The nucleus B emits a beta particle and is transformed into a nucleus C.
What is the composition of C?
(iii) What is mass number of the nucleus A?
(iv) Does the composition of C change if it emits gamma radiations?​

Answer 1

P is proton,N is neutron, E is electron.

atomic nucleus A-

P=84

N=128

E=84

i. Composition of B

After emitting alpha particle nucleus A tranformed into nuccleus B and consists of- P=844

N=128

E=0

Now nucleus B emits beta particle and is now Nucleus C consists of-

P=0

N=128

E=0

iii. mass no. of nucleus A=84+128

=212

iv. Yes then it consists of more protons inspite of 0 protons....

Answer 2

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