Question

Which set of elements is arranged in order of increasing electronegativity?

a)Al < B < C < N

b)C < N < B < Al

c)B < N < Al < C

d)N < C < B < Al

Which pair of atoms forms the most polar bond?

a)Si and F;

b)Si and Cl;

c)P and Cl;

d)P and F

Determine the bond type between each of the following pairs. a) H and H; b) N and O; c) C and I; d) K and O

Answer 1

Answer: a)Al < B < C < N

left to right in periodic table electronegativity increases,top to bottom in periodic table electronegativity decreases.

greater the electronegativity difference, more the polarity of the bond

Answer: a)Si and F;

a) H and H; pure covalent

b) N and O; polar covalent

c) C and I; polar covalent

d) K and O : ioni bond

note :   if E.N difference = 0 - 0.5 , pure covalent

                                         0.5 - 1.9 polar covalent

                                            > 1.9 ionic bond.