The ratio of the number of neutrons in $_6C^{12}$ and $_{14}Si^{28}$ is ....

The mass numbers of two elements $X$ and $Z$ are $52$ and $75$ respectively. $X$ contains $16.6 \%$ more neutrons compared to protons. $Z$ contains $27.3 \%$ more neutrons compared to protons. $X$ and $Z$ are respectively

The group having isoelectronic species is:

Which of the following statements is false?

The number of protons,neutrons,and electrons in the element $_{89}^{231}Y$ is:

The symbol of an isotope is $_{32}X^{65}$,this reveals that