The isobars are atoms with the same number of

Which property of an element is always a whole number?

Write the complete symbol for the atom with the given atomic number $(Z)$ and atomic mass $(A)$:
$(i)$ $\quad Z=17, A=35$
$(ii)$ $\quad Z=92, A=233$
$(iii)$ $\quad Z=4, A=9$

If the atomic weight of an element is $23$ times that of the lightest element and it has $11$ protons,then it contains

The introduction of a neutron into the nuclear composition of an atom would lead to a change in

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