(English Medium) ICSE Class 9 - CISCE Question Bank Solutions for Chemistry

Define the term:

Mass number

Explain the following:

An element has atoms with different mass numbers.  

Explain the following:

An element has atoms with different mass numbers.  

Name or state the following:

Atoms of the same element differing in mass number

Name or state the following:

Atoms of the same element differing in mass number

Consider the following elements: Be, Li, Na, Ca, K. Name the elements of (a) same group (b) same period.

What is meant in the periodic table by a group?

What are the following group known as?

Group 1

What are the following group known as?

Group 17

What are the following group known as?

Group 18 

Name two elements of each group.

How do atomic structures (electron arrangements) change in a period with an increase in atomic numbers moving left to right?

What happens to the number of valence electrons in atoms of elements as we go down a group of the periodic table?

Name and state the following with reference to the elements of the first three periods of the periodic table.

Noble gas with duplet arrangement of electrons.

Name and state the following with reference to the elements of the first three periods of the periodic table.

Noble gas having electronic configuration: 2, 8, 8.

Name and state the following with reference to the elements of the first three periods of the periodic table.

Group whose elements have zero valencies.

Name the alkali metals, How many electron(s) they have in their outermost orbit.

Take any one alkali metal and write its reaction with (i)oxygen (ii)water (iii)acid.

Name the method by which alkali metals can be extracted.

Name the first three alkaline earth metals.