Chapter U2, Problem SIII1RE

(a)

Interpretation Introduction

Interpretation : The more electronegative element from Zn and Br has to be identified.

Concept Introduction :

The tendency of an atom to attract shared electrons is called electronegativity. Chemists have assigned each atom a number called electronegativity value. This number represents the tendency of the atom to attract shared electrons. By comparing these numbers, one can compare the electronegativity of elements.

Answer to Problem SIII1RE

Out of zinc and bromine, bromine is more electronegative.

Explanation of Solution

The electronegativity scale is used to compare individual atoms. Atoms that are more electronegative attract bonded electrons more strongly than atoms with less electronegative value. The electronegativity values increase from left to right of the periodic table. Bromine lies to the right of zinc in the periodic table. From the electronegativity scale, electronegativity value of zinc is 1.65 and that of bromine is 2.96. Hence, bromine is more electronegative than zinc.

(b)

Interpretation Introduction

Interpretation : The more electronegative element from Li and Cs has to be identified.

Concept Introduction :

The tendency of an atom to attract shared electrons is called electronegativity. Chemists have assigned each atom a number called electronegativity value. This number represents the tendency of the atom to attract shared electrons. By comparing these numbers, one can compare the electronegativity of elements.

Answer to Problem SIII1RE

Out of lithium and caesium, lithium is more electronegative.

Explanation of Solution

The electronegativity scale is used to compare individual atoms. Atoms that are more electronegative attract bonded electrons more strongly than atoms with less electronegative value. The electronegativity values increase from bottom to top of the periodic table. Lithium is on top of the periodic table while caesium is much below lithium. From the electronegativity scale, electronegativity value of lithium is 0.98 and that of caesium is 0.79. Hence lithium is more electronegative than caesium.

(c)

Interpretation Introduction

Interpretation : The more electronegative element from gold and aluminium has to be identified.

Concept Introduction :

The tendency of an atom to attract shared electrons is called electronegativity. Chemists have assigned each atom a number called electronegativity value. This number represents the tendency of the atom to attract shared electrons. By comparing these numbers, one can compare the electronegativity of elements.

Answer to Problem SIII1RE

Out of gold and aluminium, gold is more electronegative.

Explanation of Solution

The electronegativity scale is used to compare individual atoms. Atoms that are more electronegative attract bonded electrons more strongly than atoms with less electronegative value. From the electronegativity scale, electronegativity value of gold is 2.54 and that of aluminium is 1.61. Hence, gold is more electronegative than aluminium.