(Thus in emitting a B-particle, the number nucleons in the nucleus (i.e., sum of protons and neutrons) remains same, but the number of neutrons is decreased by one and the number of protons is increased by one. In other words, by the emission of a B-particle, the mass number A does not change but the shnu 7

A nucleus of neptunium-236 contains 93 protons and 143 neutrons. This nucleus decays with the emission of an α-particle. The nucleus formed then emits a β– particle. Which diagram shows the changes in the number P of protons and the number N of neutrons in these nuclei?

A nucleus of stable phosphorus has 15 protons and 16 neutrons.​
a) What is its atomic number and mass number? ​
b) The nucleus of radio phosphorus has one neutron more than the stable nucleus. What will be its atomic number and mass number? ​
c) What will be the atomic number and mass number of new nucleus formed by the decay of a $\beta$-particle by the radio phosphorus in part (b)?​

A nucleus of stable phosphorus has 15 protons and 16 neutrons. What will be the atomic number and mass number of new nucleus formed by decay of a $\beta$-particle by the phosphorus nucleus?

A radioactive nucleus (initial mass number A and atomic number Z) emits 3$\alpha$ - particles and 2 positrons. The ratio of number of neutrons to that of protons in the final nucleus will be

The mass number of a nucleus is equal to
(a) the number of neutrons in the nucleus
(b) the number of protons in the nucleus
(c) the number of nucleons in the nucleus
(d) none of them.