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

Match the following species with their respective number of electrons:
| Species | Number of electrons |
| :--- | :--- |
| $(a)$ $O^{2-}$ | $(i)$ $18$ |
| $(b)$ $Li^{2+}$ | (ii) $2$ |
| $(c)$ $He$ | (iii) $10$ |
| $(d)$ $Ca^{2+}$ | (iv) $1$ |

The number of protons,neutrons and electrons in ${}^{13}_{6}C$ respectively are

An element $M$ has an atomic mass $19$ and atomic number $9$. Its ion is represented by

The chlorine atom differs from the chloride ion in the number of:

Which of the following particles has more electrons than neutrons?