4. Electronegativity is a measure ofA) the energy needed to remove an electron from an atom. B) the energy released when an electron is added to an atom. C) the magnitude of the negative charge on an electron. D) the attraction by an atom for electrons in a chemical bond. E) the magnitude of the negative charge on a molecule.

correct option: D

Explanation:

electronegative: it is define as the tendency of attraction of bond pair electron and it decreases top to bottom in peridic table and increasing from left to right and heighest electronegative atom in the periodic table is Fluorine and it value is 4.0

it also measures the how strongly atom can attract bond pair electron

1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.