Question

1. Name any three numerical scales of electronegativity. 

2. How electronegativity varies in the periodic table? Justify.

Answer 1

1. Pauling scale, Mullimen-Jae scale, Allred Rochow scale. 

2. Electronegativity generally increases from left to right a period and decreases from top to bottom in a group. This is because, from left to right across a period atomic size decreases and attraction between the valence electrons and the nucleus increases. From top to bottom in a group atomic size increases and attraction between the valence electrons and the nucleus decreases.