Question

a) Define the concept of electronegativity.

b) The unit for atomic radius is sometimes given in Angstrom units. What is an Angstrom unit and how does it relate to nanmotre?\

c) What does pm stand for and when is it used?

d) What units are used for ionisation energy?

Answer 1

a)

The electronegativity is defined as , the tendency of an atom to attract the shared pair of electrons in a covalent bond towords itself .It has no units because of it the only attractive property.

b)

Angstrom unit is used for the unit of radius.

1 A0 =10^-8 cm = 10^-10 m

1nano meter = 10^-9 m

1A0 = 0.1 nm

c) pm is the peco meter

1pm = 10^-12m

Peco meter is used for the unit of Wavelength and radius values

d) Ionization energy is defined as , the minimum amount of energy is required for the removal of weakly attracted electron from the isolated gaseous neutral atom.

Ionization is expressed in energy units.

e.v (or) cal (or) Kcal(or) Joules ( or) KJ.