What is the number of nucleons present in an atom having $29$ electrons and $34$ neutrons in it?

An ordinary oxygen sample contains:

$A$ monoatomic anion $(A^-)$ has $45$ neutrons and $36$ electrons. The atomic mass, group in the periodic table, and physical state at room temperature of the element $(A)$ are respectively:

Which of the following is not a hydrogen-like species?

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

An ion with mass number $37$ possesses one unit of negative charge. If the ion contains $11.1 \%$ more neutrons than the electrons,find the symbol of the ion.