two atoms with an electronegativity difference of 0.4 form a bond that is?

Question

Covalent or ionic

and are electrons shared of trasferred?

Answer 1

Covalent -- e- are shared between the two atoms.

If the electronegativity difference is 0 to 0.4 the bond is nonpolar covalent.

If the electronegativity difference is 0.5 to 1.2 the bond is polar covalent.

If the electronegativity difference is over 1.2 the bond is ionic and electrons are not shared--they are transferred from one to the other.

Answer 2

polar covalent, shared

We say that the bond is polar covalent, meaning that the bond consists of electrons shared between two atoms (therefore covalent) but shared unequally, thus giving the bond a positive and a negative end, a condition described by the term polar.

In summary, then, the three types of bonds are: (1) a covalent bond, in which the electrons are shared equally; (2) a polar covalent bond, in which the electrons are shared unequally; and (3) an ionic bond, in which electrons are transferred from one atom to the other.

Answer 3

ionic