Question

Which is most likely true about electronegativity?
It tends to be the same across a period.
It tends to be the same down a group.
It tends to increase across a period.
It tends to increase down a group.

Answer 1

Answer:

c. it tends to increase across a period.

Electronegativity (χ) is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself.

Atoms with higher electronegativity attracts more electrons towards it, electrons are closer to that atom.  

For example, in ionic salt lithium fluoride (LiF), fluorine has electronegativity approximately χ = 4 and lithium χ = 1 (Δχ = 4 - 1; Δχ = 3), fluorine attracts electron and it has negative charge and lithium has positive charge.  

Lithium and fluorine are in period 2, lithium is metal far left and fluorine is nonmetal far in the right at the period. Nonmetals have higher tendency to attract shared electrons

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Answer 2

It is true about electronegativity that it tends to increase across a period.

Explanation:

Electronegativity is defined as the ability of an element or atom to attract one or more number of electrons towards itself. And, in the periodic table when we move across a period there occurs an increase in electronegativity.

Whereas when we move across a group in a periodic table then there occurs a decrease in electronegativity of the atoms. Metals are electropositive in nature.

On the other hand, non-metals are electronegative in nature.

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