Atomic Mass and Composition of Nucleus

Atomic number of a nucleus is $\mathrm{Z}$ and atomic mass is $\mathrm{M}$. Find the number of neutrons.

What should be the ratio of neutron and proton for stability of heavy nucleus?

What are isotones?

Explain atomic mass unit or AMU.

What are isotopes? Explain with an example.

Explain about nucleons.

How do you find the charge of the nucleus?

It is known that the radius of the nucleus of copper, ${}_{29}{}^{64}\mathrm{Cu}$ is $4.8 \mathrm{fm}.$ A nucleus $X$ has $130$ neutrons and it has a radius of $7.2 \mathrm{fm}.$ The number of protons in this nucleus is

Who discovered neutron

If the nuclear radius of  ${}^{27}\mathrm{Al}$ is $3.6 \mathrm{fm}$, the approximate nuclear radius of ${\mathrm{Cu}}^{64}$ in $\mathrm{fm}$ is;

When a $\mathrm{\beta }-$particle is emitted from a nucleus then its neutron-proton ratio-

Explain what are isotones.

Consider the following statements $(\mathrm{X}$ and $\mathrm{Y}$ stand for two different elements$)$

$\mathrm{I}.$ $32{\mathrm{X}}^{65}$ and ${}_{33}\mathrm{Y}^{65}$ are isotopes.

$\mathrm{II}.$ $42X^{86}$ and $42Y^{85}$ are isotopes.

$\mathrm{III}.$ $85{\mathrm{X}}^{174}$ and $88{\mathrm{Y}}^{177}$ have the same number of neutrons.

$\mathrm{IV}.$ $92X^{235}$ and ${}_{94}\mathrm{Y}^{235}$ are isobars.

The correct statements are:

What are isotones? Give example.

Assertion : $\mathrm{C}$ and $\mathrm{Si}$ both have same lattice structure, having $4$ bonding electrons in each. However, $\mathrm{C}$ is insulator where as $\mathrm{Si}$ is intrinsic semiconductor.
Reason : The four bonding electrons in the case of $\mathrm{C}$ lie in the second orbit, whereas in the case of $\mathrm{Si}$ they lie in the third.

Which of the following gives the correct number of protons and neutrons in a nucleus of carbon-$14 \left({}_6{}^{14}C\right)?$

The mass number of an atom $A=38$ and its electronic configuration is $1s^2 2 s^2 2p^6 3s^2 3p^4$. The number of neutrons and protons in the nucleus will be

Which one of the following particle is unstable?

When atoms are bombarded with the alpha particles, only a few in a million suffer deflection and the others pass out undeflected. This is because

Atomic weight of boron is $10.81$ and it has two isotopes  ${}_5{}^{10}\mathrm{B}$ and ${}_5{}^{11}\mathrm{B}$ in nature. What must have been the ratio of number of atoms in them?