In the given graph,which point represents an alkali metal with the least atomic number?

The correct order in which the first ionisation potential increases is

Which of the following statements is incorrect?

Sodium generally does not show an oxidation state of $+2$,because of its

For an element,the values of $IP_1, IP_2, IP_3, IP_4$ and $IP_5$ are $7.1, 14.3, 34.5, 46.8$ and $162.2 \ eV$ respectively. Which of the following is the most likely element?

The successive ionisation enthalpies of an element $X$ in $(kJ \ mol^{-1})$ are $1012$,$1907$,$2955$,$4955$,$6275$ and $21,260$ respectively. The element $X$ is: