(i) Neon has a completely filled valence shell; hence, it has the highest first ionisation energy.
(ii) Fluorine is small-sized and it has a high nuclear charge; therefore, it has the highest electronegativity.
(iii) Lithium has the lowest nuclear charge; it is the largest atom in the second period.
(iv) The reactivity of non-metals increases on moving left to right across a period up to fluorine; hence, fluorine is the most reactive non-metal.
(v) Lithium is the most reactive metal because of its large size and small ionisation energy.