Using Slater's rule calculate the effective nuclear charge on a 3p electron in aluminium and chlorine. Explain how these results relate to the atomic radius of the two atoms.

(a) State Mendeleev's periodic law.
(b) Describe about the merits of Mendeleev's periodic table.

Explain about the anomalies of Mendeleev's periodic table.

Explain about the structural features of Moseley's long form of periodic table.

Explain the merits of Moseley's long form of periodic table.

Explain about the general characteristics of periods.

Explain about the salient features of groups.

Explain the classification of elements based on chemical behaviour and on physical properties.

(a) Define atomic radius.
(b) What are the difficulties in determining atomic radius?

Prove that the atomic radii is a periodic property.

Explain about the factors that influence the ionization enthalpy.

(a) Define ionization energy.
(b) Prove that ionization energy is a periodic property.

Distinguish between electron affinity and electron negativity.

What are the anomalous properties of second period elements?