The mass density of a nucleus varies with mass number $A$ as
$A^2$
$A$
constant
$1/A$
The nuclei ${ }_{6} C^{13}$ and ${ }_{7} N^{14}$ can be described as
In the nucleus of ${ }_{11} N a^{23}$, the number of protons, neutrons and electrons are
Which of the following particles are constituents of the nucleus
Choose the correct statement
In the following reaction $_{12}M{g^{24}}{ + _2}H{e^4}{ \to _{14}}S{i^X}{ + _0}{n^1},X$ is