Arrange the following elements in order of increasing electronegativity. In Al O Ga B

This is an Lon Capa question I thought I knew the answer but which I though it would be Al, In, Ga, B and O! I tried it forward backwards every possible way! Please help!

In < Ga < Al < B < O
In, Ga, Al and B all make cations, (+)
the more electronegative of the 4 is the smallest element, B
O is a group 6 element and makes anions, (-) this is the most electronegative of the 4

Electronegativity is the measurement of how strong an atom attracts electrons to itself. The closer the number of valence electrons of an atom is to seven, (except eight), the greater the electronegativity. Also the larger the atom the more weakly its nucleus can exert force on electrons, so the larger an atom the smaller electronegativity.

Putting that aside, electronegativity increases from left to right on the periodic table. And decreases from top to bottom. Even simpler the closer you are to fluorine the greater the electronegativity, the closer you are to francium the smaller the electronegativity.

But to answer your question it should be: Ln, Ga, Al, B, O.

http://0.tqn.com/d/chemistry/1/0/w/v/Per…

Do work.

A general rule of thumb is electronegativity increases to the right on the periodic table, and increases going up on the table.