A nucleus $A$ has $86$ protons and $128$ neutrons. What is the mass number of the nucleus $A$?

Q. An atomic nucleus A is composed of $84$ protons and $128$ neutrons. The nucleus A emits $\alpha$-particle and is transformed into a nucleus B. What is the composition of B ?

Q. a) An atomic nucleus A is composed of 84 protons and 128 neutrons. The nucleus A emits an α-particle, and is transformed into a nucleus B. What is the composition of B?
b) The nucleus B emits a β-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 γ-radiation.

Q. A nucleus of stable phosphorus has $15$ protons and $16$ neutrons. The nucleus of radio phosphorus has one neutron more than the stable nucleus. What will be its atomic number and mass number ?

Q. A nucleus of stable phosphorus has $15$ protons and $16$ neutrons. What is its atomic number and mass number ?

Q.

An atomic nucleus A is composed of 84 protons and 128 neutrons.

The atomic nucleus A emits an alpha particle and is transformed into nucleus B. The atomic nucleus B emits a $\beta$ - particle and is transformed into a nucleus C. What is the composition of atomic nucleus C?