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: 03/09/2019
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.
Calculate the number of neutrons, protons and electrons (i) atomic number 3 and mass number 7 (ii) atomic number 92 and mass number 238.
2.
State the law of multiple proportions
3.
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.
4.
The number of protons, neutrons and electrons present respectively in \(_{ 35 }^{ 80 }{ Br }\)
80, 80, 35
35, 55, 80
35, 35, 80
35, 45, 35
5.
Change in the number of neutrons in an atom changes it to
an ion
an isotope
an isobar
another element
6.
Among the following the odd pair is
8O18,9F19
18Ar40,7N14
14Si30, 15P31
24Cr54, 19K39
7.
The maximum number of electron in L Shell is 10
8.
Electrons have negligible mass and charge.
9.
In an atom, electrons revolve around the nucleus in fixed orbits
10.
The valency of Argon is ________
11.
The number of neutrons present in \(_{ 3 }^{ 7 }{ Li }\) is ------
12.
_________ isotope is used in the nuclear reactors.
13.
Calcium and Argon are examples of a pair of __________
14.
Ca2+ has completely filled outer shell. Justify your answer
15.
Compare the charge and mass of protons and electrons.
16.
Name an element which has the same number of electrons in its first and second shell
17.
Explain the postulates of Bohr’s atomic model.
1.
| 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 |
2.
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.
3.
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
4.
(d)
35, 45, 35
5.
(b)
an isotope
6.
(d)
24Cr54, 19K39
7.
(b)
8.
(a)
9.
(a)
10.
( )
zero
11.
( )
4
12.
( )
Uranium-235
13.
( )
isobars
14.
Atomic number of calcium is 20. When it loses 2 electrons Ca2+ is formed.
\(Ca\quad -\quad 2e\quad \longrightarrow \quad C{ a }^{ +2 }\)
2,8,8,2 2,8,8
According to Bohr and Bury rule the outermost shell cannot have more than 8 electrons. So Ca2+ has completely filled outer shell.
15.
| Particle | Mass | Charge |
| Proton | 1.672 x 10-24 g | 1.602 x 10-19 C |
| Electron | 9.108 x 10-28 g | -1.602 x 10-19 |
16.
Beryllium.
17.
(i) In atoms, electrons revolve around the nucleus in certain special or permissible orbits known as discrete orbits or shells or energy levels.
(ii) While revolving in these discrete orbits the electrons do not radiate energy.
(iii) The circular orbits are numbered as 1, 2, 3, 4, ... or designated as K, L, M, N, shells. These numbers are referred to as principal quantum numbers (n)
(iv) K shell (n = 1) is closest to the nucleus and is associated with lowest energy. L, M, N, .... etc are the next higher energy levels. As the distance from the nucleus increases the energy of the shells also increases.
(v) The energy of each orbit or shell is a fixed quantity and the energy is quantized.
(vi) As the distance from the nucleus increases, the size of the orbits also increases.
(vii) Maximum number of electrons that can be accommodated in an energy level is given by 2n2 where n is the principal quantum number of the orbit.
(viii) When an electron absorbs energy, it jumps from lower energy level to higher energy level.
(ix) When an electron returns from higher energy level to lower energy level, it gives off energy.
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
