Which compound is most likely to be held together by a covalent bond based on the electronegativity difference between its two atoms?

Question

Which compound is most likely to be held together by a covalent bond based on the electronegativity difference between its two atoms?

(1 point)

CaBr
CaBr

NO
NO

NaCl
NaCl

CO

Answer 1

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Answer 2

Answer is

NO

Answer 3

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Answer 4

To determine which compound is most likely to be held together by a covalent bond based on the electronegativity difference between its two atoms, we need to compare the electronegativity values of the atoms in each compound.

The electronegativity is a measure of an atom's tendency to attract electrons towards itself in a chemical bond. On the Pauling scale, electronegativity values range from 0.7 (for cesium) to 4.0 (for fluorine).

For a covalent bond to form, the electronegativity difference between the two atoms should be relatively small, usually less than 1.7. A large electronegativity difference indicates an ionic bond, where electrons are completely transferred from one atom to another.

Let's compare the electronegativity values for the compounds you provided:

1. CaBr: Calcium (Ca) has an electronegativity of 1.0, while Bromine (Br) has an electronegativity of 2.8. The electronegativity difference is 1.8, which is larger than 1.7, suggesting an ionic bond.

2. NO: Nitrogen (N) has an electronegativity of 3.0, while Oxygen (O) has an electronegativity of 3.5. The electronegativity difference is 0.5, which is smaller than 1.7, indicating a covalent bond.

3. NaCl: Sodium (Na) has an electronegativity of 0.9, while Chlorine (Cl) has an electronegativity of 3.0. The electronegativity difference is 2.1, which is larger than 1.7, suggesting an ionic bond.

4. CO: Carbon (C) has an electronegativity of 2.5, while Oxygen (O) has an electronegativity of 3.5. The electronegativity difference is 1.0, which is smaller than 1.7, indicating a covalent bond.

Based on the electronegativity differences, the compound most likely to be held together by a covalent bond is CO (carbon monoxide).

Answer 5

Here is how you decide. Take the difference between the electronegativity of the two elements listed. If the difference is 1.7 it is a 50-50 ionic/covalent bond. Over that we call them ionic. Less than that we call them covalent although those close to the 50-50 mark we usually say polar covalent. PURE covalent bonds are formed between the same atoms; i.e., H2, N2, O2, etc.