Electronegativity
increases as you go across a period from left to right. Across
the periodic table elements increase in the number of electrons in their
outer energy level. As the number of electrons in an elements outer energy
level nears a full octet (8) it gets increasingly difficult to remove
an electron. Noble gases do not have an electronegativity value because
they do not readily form compounds.
Electronegativity decreases as you go down a group or family.
Inner energy level electrons block the attraction between the positively
charged nucleus and the electrons in the outer energy level. This shielding
effect makes it easier to remove a valence electron as the number of energy
levels increases.
Highest
electronegativity:
fluorine(9) : 3.98
Lowest electronegativity:
francium(87) : 0.7
Undefined:
(2)
(10)
(18)
(36)
(54)
(86)
(103)
(104)
(105)
(106)
(107)
(108)
(109)
(110)
(111)
(112)
(114)
Click column
name to sort 
