Electronegativity values of some elements are given. Using these value

1.	Electronegativity values of some elements are given. Using these values, find whether the following compounds are ionic or covalent. (Electronegativity of Ca = 1, O = 3.5, C = 2.5, S = 2.58, H = 2.2, F = 3.98) i) Sulphur dioxide (SO2) ii) Water (H2O) iii) Calcium fluoride (CaF2) iv) Carbon dioxide (CO2)
Answer» (i) SO₂ Electronegativity difference = 3.5 – 2.58 = 0.92 If the electronegativity difference is less than 1.7, it shows covalent character. (ii) Water (H₂O) Electronegativity difference = 3.5 – 2.2 = 1.3 If the electronegativity difference is less than 1.7 it forms covalent compounds. (iii) CaF₂ Electronegativity difference = 3.98 -1.0 = 2.98 If the electronegativity difference is greater than 1.7 if forms ionic compounds. (iv) CO₂ Electronegativity difference = 3.5 – 2. 5 = 1.0 If the electronegativity difference is less than 1.7 it shows covalent compounds.

Electronegativity values of some elements are given. Using these values, find whether the following compounds are ionic or covalent. (Electronegativity of Ca = 1, O = 3.5, C = 2.5, S = 2.58, H = 2.2, F = 3.98) i) Sulphur dioxide (SO2) ii) Water (H2O) iii) Calcium fluoride (CaF2) iv) Carbon dioxide (CO2)

Answer»

(i) SO₂

Electronegativity difference = 3.5 – 2.58 = 0.92

If the electronegativity difference is less than 1.7, it shows covalent character.

(ii) Water (H₂O)

Electronegativity difference = 3.5 – 2.2 = 1.3

If the electronegativity difference is less than 1.7 it forms covalent compounds.

(iii) CaF₂

Electronegativity difference = 3.98 -1.0 = 2.98

If the electronegativity difference is greater than 1.7 if forms ionic compounds.

(iv) CO₂

Electronegativity difference = 3.5 – 2. 5 = 1.0

If the electronegativity difference is less than 1.7 it shows covalent compounds.