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two atoms with an electronegativity difference of 2.1, will form a bond that is:

ionic, because electrons are shared.

ionic, because electrons are transferred.

covalent, because electrons are shared.

covalent, because electrons are transferred.

Answer;

ionic, because electrons are transferred.

Explanation;Electronegativity is the strength an atom has to attract a bonding pair of electrons to itself.The rule is that when the electronegativity difference between atoms is greater than 2.0, the bond formed between the atoms is considered ionic and results from tranfer of electrons between the atoms.If the difference in electronegativities between the two atoms is greater than 0, but less than 2.0, the bond is  covalent such that between 0.0 and 0.4 indicates a non-polar covalent bond and polar covalent if the difference is between 0.5 and 1.9.