Electronegativity generally increases across a period and decreases down a group.

Electropositivity generally increases across a period and decreases down a group.

Smaller atoms tend to have higher electronegativity.

Larger atoms tend to have higher electropositivity.

F

He

Ne

Na

${X_A} - {X_B} = 0.208\sqrt \Delta$

${X_A} + {X_B} = 0.208\sqrt \Delta$

${X_A} - {X_B} = 0.208{\Delta ^2}$

${X_A} - {X_B} = \sqrt \Delta$

Br

CI

P

Si

${\rm{A}}{{\rm{l}}_2}{{\rm{O}}_3} < MgO < F{{\rm{e}}_2}{{\rm{O}}_3} < C{{\rm{r}}_2}{{\rm{O}}_3}$

${\rm{C}}{{\rm{r}}_2}{{\rm{O}}_3} < MgO < A{{\rm{l}}_2}{{\rm{O}}_3} < F{{\rm{e}}_2}{{\rm{O}}_3}$

${\rm{F}}{{\rm{e}}_2}{{\rm{O}}_3} < C{{\rm{r}}_2}{{\rm{O}}_3} < A{{\rm{l}}_2}{{\rm{O}}_3} < MgO$

${\rm{F}}{{\rm{e}}_2}{{\rm{O}}_3} < A{{\rm{l}}_2}{{\rm{O}}_3} < C{{\rm{r}}_2}{{\rm{O}}_3} < MgO$

Li

F

Cl

Fe

Sodium

Magnesium

Silicon

Oxygen

$54\%$

$46\%$

$23\%$

$72\%$

46%

54%

68%

82%

Increases

Decreases

Remains the same

Fluctuates

ZnO

${\rm{A}}{{\rm{l}}_2}{{\rm{O}}_3}$

${\rm{A}}{{\rm{s}}_2}{{\rm{O}}_3}$

${{\rm{K}}_2}{\rm{O}}$