Chemistry 5 Marks Questions

Each first element of a group differs in properties with other members of group. Explain the statement with reason.
or
In second period there is a difference between properties of elements. Why?

Write periodic trends of valency and oxidation state in periodic table

Write the applications of electronegativity

Define electronegativity. How it is different from electron gain enthalpy? Explain the periodic trend of electronegativity in periodic table.

What is electron gain enthalpy? State the periodic trend of it in groups and periods.

What is ionization enthalpy? Explain its change in group and period of periodic table.

Give general characters of elements of s, p, d and f-block.

Classify the elements on basis of electronic configuration.

Explain electronic configuration of elements according to period.

State modern periodic law and explain modern form of periodic table.

"For classification of elements atomic number is more appropriate in comparison to atomic mass." Comment.

Explain IUPAC system of nomenclature of elements with example.