AP BIOLOGY

Detailed explanation-1: -As a result, the most electronegative elements are found on the top right of the periodic table, while the least electronegative elements are found on the bottom left.

Detailed explanation-2: -Since electronegativity measures the amount of attraction between an atom and an electron, noble gases do not have electronegativity.

Detailed explanation-3: -Note. This simplification ignores the noble gases. Historically this is because they were believed not to form bonds-and if they do not form bonds, they cannot have an electronegativity value.

Detailed explanation-4: -Noble Gases have 8 electrons in it’s outer shell, therefore it does not need to gain electrons to complete its shell. Because electronegativity measures the tendency to gain electrons and noble gases do not need to gain electrons, then the noble gases have no electronegativity.

Detailed explanation-5: -Why are noble gases excluded from this trend? As you go down in a group, electron affinity decreases. As you move across a period, electron affinity increases. Noble gases are excluded from this trend because they have a complete set of electrons and so don’t follow the general trend for electron affinities.