9th Science Chemistry
Unit-11-Atomic Structure
Question Paper, Answer key
2021-2022
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Assignment
Class : 9 Subject: Science
(Chemistry)
Unit-11-Atomic Structure
Part - A
I. One mark questions:
1. The energy of K shell near the nucleus is ----
a) Higher
b) lower
c) Equal
d) Very high
2. What are Nucleons?
a) Proton + Neutron
b) Proton + electron
c) Proton
d) Neutron
3. Atomic number of an atom depends upon ________
a) Number of Protons
b) Number of electrons
c) Number of Protons + Neutrons
d) Both a and b
4. ------Is an example for Isotone
a) Argon and Carbon
b) Uranium and Carbon
c) Carbon and Boron
d) Sulphur and Boron
5. Which quantum Number specify the symbol " l "
a) Spin quantum Number
b) Principal Quantum Number
c) Azimuthal Quantum Number
d) Magnetic quantum Number
Part – B
II. Short Answer.
1. What is mean by valance?
2. Draw the geometric Representation of Aluminium atom?
3. State the law of combining volumes.
Part – C
III. Write in detail.
1. Explain - Bohr’s atomic model?
2. Explain the quantum Numbers?
Part-D
IV. Activities
Complete the following table
| Atomic number | Mass number | Number of Neutrons | Number of Protons | Number of Electrons | Name of the Element |
|---|---|---|---|---|---|
| 9 | - | 10 | - | - | - |
| 16 | - | 16 | - | - | - |
| - | 24 | - | - | 12 | - |
| - | 2 | - | 1 | - | - |
| 1 | 0 | 1 | 1 | - |
