In the modern periodic table, the period indicates the value of:

Anything that influences the valence electrons will affect the chemistry of the element. Which one of the following factors does not affect the valence shell?

Which one of the following statements is incorrect in relation to ionization enthalpy?

Considering the elements $\mathrm{B}, \mathrm{Al}, \mathrm{Mg},$ and $\mathrm{K}$, the correct order of their metallic character is:

Considering the elements $\mathrm{F}, \mathrm{Cl}, \mathrm{O} \mathrm{and} \mathrm{N},$ the correct order of their chemical reactivity in terms of oxidising property is: