What are isoelectronic ions? Give examples.

Magnesium loses electrons successively to form Mg⁺, Mg²⁺ and Mg³⁺ ions. Which step will have the highest ionisation energy and why?

Define electro negativity.

Give the general electronic configuration of lanthanides and actinides.

Briefly outline anomalies of Mandeleev's periodic table

Explain how will you find the atomic number of an element from the frequency of X-rays emitted by an element.

Mention the characteristics of 'd' block elements.

What are lanthanides and Actinides? [OR) Mention the characteristics of 'f' block elements.

Explain the influence of shielding effect as the ionisation energy of elements

Define 'electron affinity'.

What is the basic difference in approach between Mandeleev's periodic law and modem periodic law.

Write a note about Chancourtois classification.

State the Newland's law of octaves.

Write any two characteristic properties of alkali metals

Write any two characteristic properties of alkaline earth metals.