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Science CBSE Homework Assignments
Class 9
Structure of the atom
Atomic number and Mass number
1.
Atomic number and Mass number II
Task:
3
m.
What information do you get from the below figure about the atomic number, mass number and valency of atoms X, Y and Z? Give your answer in a tabular form.
Element
Atomic number
Mass number
Valency
X
5
11
6
6
22
11
5
2
3
Y
18
8
10
18
10
8
2
3
6
Z
16
15
31
15
16
31
3, 6
3, 5
3, 4
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