Electronic Configurations and Types of Elements: s-, p-, d-, f- Blocks

Among the second period elements the actual ionization enthalpies are in the order $\mathrm{Li} < \mathrm{B} < \mathrm{Be} < \mathrm{C} < \mathrm{O} < \mathrm{N} < \mathrm{F} < \mathrm{Ne}.$
Explain why$\mathrm{Be}$ has higher ${∆}_{\mathrm{i}}\mathrm{H}$than $\mathrm{B}$
 

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

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 of the following statements related to the modern periodic table is incorrect?

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

 Write the general outer electronic configuration of $\mathrm{s}‐, \mathrm{p}‐, \mathrm{d}‐$ and $\mathrm{f}‐$block elements.