100+ Periodic Classification of Elements Questions and Answers - 2

Question: 6

Define electronegativity?

Electronegativity is a measure of the tendency of an atom to attract electrons to itself.

Question: 7

What is homologous series?

A group of organic compounds having similar structure and chemical properties is known as homologous series.

Question: 8

What is the law of Octaves?

Newland arranged the elements in the order of increasing atomic masses and noted a striking similarity between every eighth element.

Question: 9

What is meant by radiotherapy?

The phenomenon of using radioactive isotopes for curing diseases is known as radiotherapy.

Question: 10

What is meant by half life period?

The time taken by a radioactive substance to reduce to half of its original mass is called as half life period.