Which of the following atoms or ions is isoelectronic with neon $(Ne)$?

An ordinary oxygen sample contains:

The number of electrons in a neutral atom of an element is equal to its

The electronic configuration of a dipositive metal $M^{2+}$ is $2, 8, 14$ and its atomic weight is $56 \ a.m.u.$ The number of neutrons in its nuclei would be

If $W$ is the mass number and $N$ is the atomic number of an element,then:

The specific charge of a proton is $9.6 \times 10^7 \ C \ kg^{-1}$. What will be the specific charge for an $\alpha$-particle?