Two nuclei which are not identical but have the same number of nucleons represent

Which of the following is not correct?

Successive emission of an $\alpha$-particle and two $\beta$-particles by an atom of an element results in the formation of its

Which of the following pairs is an example of isotones?

$_{35}X^{88}$ is an unstable isotope,which decays in two successive steps to produce the stable isotope $_{32}Z^{84}$ as $_{35}X^{88}$ $\xrightarrow{I} Y$ $\xrightarrow{II} _{32}Z^{84}$. The correct statement is (possible emissions are $\alpha, \beta^-$,positron,neutron,and $_1H^1$,and in each step only one particle is involved).

Which of the following pairs of nuclides is an example of isotones?