An element has the electronic configuration $1s^2 2s^2 2p^6 3s^2 3p^4$. Predict its period,group,and block.

Consider the following statements:
$(i) Na_2O < MgO < ZnO < P_4O_6$ - Acidic property
$(ii) F > Cl > Br$ - Electron gain enthalpy
$(iii) M^{2-} > M^{-} > M^{+} > M^{2+}$ - Ionic size
$(iv)$ The second ionisation enthalpy of $Cu$ is more than the second ionisation enthalpy of $K$.
Which of the following is the correct representation of True $(T)$ / False $(F)$ for the given statements?
$(a)$ $T, T, F, F$
$(b)$ $F, T, F, T$
$(c)$ $F, F, F, T$
$(d)$ $T, F, T, F$

In which of the following options does the order of arrangement not agree with the variation of property indicated against it?

Maximum enthalpy change is associated with which of the following reactions?

Which of the following statements is not correct?

Which one of the following sets of ions represents a collection of isoelectronic species?