9th Standard Syllabus & Materials
9th Standard
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NEW9th Standard
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NEW9th Standard
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NEW9th Standard
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NEW9th Standard
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NEW9th Standard
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Published on: 04/10/2019
Term 1 Atomic Structure
Download Tamil Nadu 9th Standard Science question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
Questions + Answers key
Take MCQ Science Test1.
Define quantum numbers
2.
Assign the valency of magnesium and sulphur
3.
Calculate the number of neutrons, protons and electrons (i) atomic number 3 and mass number 7 (ii) atomic number 92 and mass number 238.
4.
Draw the structure of oxygen and sulphur atoms.
5.
What is isotone? Give an example.
6.
List the uses of isotopes?
7.
State the law of multiple proportions
8.
An atom has 11 protons, 11 electrons and 12 neutrons. What is the atomic number and the name of the element?
9.
Methane burns in oxygen to form carbon dioxide and water vapour as given by the equation
CH4(g) + 2O2(g) тЮЭ CO2(g)+ 2H2O(g)
Calculate: (i) the volume of oxygen needed to burn completely 50 cm3 of methane and (ii) the volume of carbon dioxide formed in this case.
1.
The number which designate and distinguish various atomic orbitals and electrons present in an atom are called quantum numbers.
2.
Electronic configuration of Magnesium is 2, 8, 2. So the valency is 2.
Electronic configuration of Sulphur is 2, 8, 6. So the valency is 2(8 - 6).
3.
| S.No | Element | Atomic number |
Mass number |
No. of protons |
No. of electrons |
No. of neutrons |
| 1. |
Lithium |
3 |
7 |
3 | 3 | 4 |
| 2. | Uranium | 92 | 238 | 92 | 92 | 146 |
4.
5.
Atoms of different elements with different atomic numbers and different mass numbers, but with the same number of neutrons are called isotones.
Example: Boron and Carbon have same number of neutrons.
6.
Uses of Radioactive isotopes:
1. Uranium 235 is used as fuel in nuclear reactor.
2. Cobalt 60 is used in the treatement of cancer.
3. Iodine 131 is used in the treatment of goitre.
4. C-14 is used in carbon dating.
7.
When two elements A and B combine together to form more than one compound, the masses of A which separately combines with the fixed mass of B are in simple ratio. This law was proposed by John Dalton.
8.
Atomic number = Number of protons = Number of electrons
Number of protons = Number of electrons = 11
∴ Atomic number = 11
Name of the element is Sodium.
9.
CH4(g) +2O2(g) → CO2(g) +2H2O(g)
1 2 1 2
volume volumes volumes volumes
1x 2x 1x 2x
50cm3 50cm3 50cm3 50cm3
50cm3 100cm3 50cm3 100cm3
Volume of oxygen used = 100 cm3
Volume of carbondioxide formed = 50 cm3
9th Standard Syllabus & Materials
9th Standard
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NEW9th Standard
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NEW9th Standard
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NEW9th Standard
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Tamilnadu Stateboard 9th Standard Subjects
Tamilnadu Stateboard Standards
