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How do electronegativity values change across a row?

Answer 1

Across a Periodic Row from left to right as we face the Table, electronegativity should increase.

The ability of an atom in a chemical bond to polarize electron density towards itself is thought to be the definition of electronegativity. There are several scales for measuring electronegativity, the most popular being the Pauling scale, which was developed first.

Discounting the Noble Gases (which after all do not tend to form chemical bonds), given the above definition, we would expect the #"Group VII halogens"# and #"Group VI chalcogens"# to be the most electronegative atoms, and indeed we would be correct. #F# and #O#, which head the Group, are the most electronegative atoms.

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Answer 2

Christian Anderson

Electronegativity values generally increase across a row from left to right in the periodic table.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.