9th Class
Science
Structure of the Atom
Question Bank
9th CBSE Science Structure of the Atom
question_answer
In the following table the mass numbers and 'the atomic
numbers of certain elements are given.
Element
A
B
C
D
E
Mass No.
1
7
14
40
40
At. No.
1
3
7
18
20
(i)Select a pair of isobars from the above table.
(ii) What would be the valency of element C listed in the
above table?
(iii) Which two subatomic particles are equal in number in a neutral
atom?