Which statement applies to electronegativity? electronegativity increases across a period. all atoms with the same number of electron shells have equal electronegativities. electronegativity is the amount of energy required to remove an electron from a gaseous atom. electronegativity increases down a group.

Electronegativity increases across a period.  

Explanation:

Electronegativity is defined as ability of an atom to attract shared pair of electrons in a bond toward itself.

Electronegativity increases across the period because when we move across the period from left to right numbers of protons and electrons are increased. By increase in number of protons ,nuclear charge also increases due to which electrons present in an atom are strongly attracted towards the nucleus. And due to presence of strong nuclear charge shared pair of electrons in a bond are also attracted towards nucleus of an electronegative atom.

answer carbon and three oxygen atoms;