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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
Question:
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
11
6
5
11
6
22
3
5
2
Y
8
10
18
10
8
16
3
2
6
Z
15
16
31
31
15
16
3, 5
3, 4
3, 6
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