Chemical behaviour of an atom is determined by

The element $Uuq$ (Ununquadium,atomic number $Z = 114$) contains $12.8 \%$ more neutrons compared to protons. What is the approximate mass number of it?

What do you understand by isoelectronic species? Name a species that will be isoelectronic with each of the following atoms or ions.
$(i)$ $F^{-}$
$(ii)$ $Ar$
$(iii)$ $Mg^{2+}$
$(iv)$ $Rb^{+}$

Elements $A$ and $B$ have the same mass number. Their atomic numbers are $27$ and $30$ respectively. If the mass number of $A$ is $57$,find the number of neutrons in $B$.

If $A^{+}$ has $11$ protons,then the number of electrons in it is...........

How many neutrons are present in the nucleus of $_{88}Ra^{226}$?