1. what is the pattern of increasing electronegativity of elements on the periodic table?

Brief Explanations:

Electronegativity increases across a period from left - to - right as the nuclear charge increases and atomic radius decreases, allowing the nucleus to attract bonding electrons more strongly. It also increases up a group as the outermost electrons are closer to the nucleus and less shielded.

Answer:

Electronegativity increases across a period (left to right) and up a group (bottom to top) on the periodic table.