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Chapters
2: Motion
3: Fluids
4: Electric charge and Electric current
5: Magnetism and Electromagnetism
6: Light
7: Heat
8: Sound
9: Universe
10: Matter Around Us
▶ 11: Atomic Structure
12: Periodic Classification of Elements
13: Chemical Bonding
14: Acids, Bases and Salts
15: Carbon and its Compounds
16: Applied Chemistry
17: Animal Kingdom
18: Organisation of Tissues
19: Plant Physiology
20: Organ Systems in Animals
21: Nutrition and Health
22: World of Microbes
23: Economic Biology
24: Environmental Science
25: Computer – LibreOffice Impress
![Samacheer Kalvi solutions for Science [English] Class 9 TN Board chapter 11 - Atomic Structure - Shaalaa.com](/images/science-english-class-9-tn-board_6:5f2b1b2038084cf381bfa42c826a928c.jpg "Samacheer Kalvi solutions for Science [English] Class 9 TN Board chapter 11 - Atomic Structure")
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Solutions for Chapter 11: Atomic Structure
Below listed, you can find solutions for Chapter 11 of Tamil Nadu Board of Secondary Education Samacheer Kalvi for Science [English] Class 9 TN Board.
Samacheer Kalvi solutions for Science [English] Class 9 TN Board 11 Atomic Structure Exercise [Pages 135 - 137]
Choose the correct answer.
Among the following the odd pair is
\[\ce{^18_8{O}}\], \[\ce{^19_9{F}}\]
\[\ce{^40_18{Ar}}\], \[\ce{^14_7{N}}\]
\[\ce{^30_14{Si}}\], \[\ce{^31_15{P}}\]
\[\ce{^40_20{Cr}}\], \[\ce{^39_19{K}}\]
Change in the number of neutrons in an atom changes it to ______.
an ion
an isotope.
an isobar
another element
The term nucleons refer to ______.
protons and electrons
only neutrons
electrons and neutrons
protons and neutrons
The number of protons, neutrons and electrons present respectively in \[\ce{^80_35{Br}}\] are
80, 80, 35
35, 55,80
35, 35, 80
35, 45, 35
The correct electronic configuration of potassium is ______.
2,8,9
2,8,1
2,8,8,1
2,8,8,3
State true or false. If false, correct the statement.
In an atom, electrons revolve around the nucleus in fixed orbits.
True
False
State true or false. If false, correct the statement.
Isotopes of an element have different atomic numbers.
True
False
State true or false. If false, correct the statement.
Electrons have negligible mass and charge.
True
False
State true or false. If false, correct the statement.
Smaller the size of the orbit, lower is the energy of the orbit.
True
False
State true or false. If false, correct the statement.
The maximum number of electron in L Shell is 10.
True
False
Fill in the blanks.
Calcium and Argon are examples of a pair of ______.
Total number of electrons that can be accommodated in an orbit is given by __________.
______ isotope is used in the nuclear reactors.
The number of neutrons present in 73Li is ______.
The valency of Argon is ______.
Match the following.
| a. | Dalton | 1. | Hydrogen atom model |
| b. | Chadwick | 2. | Discovery of nucleus |
| c. | Rutherford | 3. | First atomic theory |
| d. | Neils Bohr | 4. | Plum pudding model |
| 5. | Discovery of neutrons |
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 | Magnesium |
| ______ | 2 | ______ | 1 | ______ | ______ |
| ______ | 1 | 0 | 1 | 1 | ______ |
Answer very briefly.
Name an element which has the same number of electrons in its first and second shell.
Write the electronic configuration of K and Cl
Write down the names of the particles represented by the following symbols and explain the meaning of superscript and subscript numbers attached.
`""_1"H"^1`, `""_0"n"^1`,`""_(-1)"e"^0`
For an atom ‘X’, K, L and M shells are completely filled. How many electrons will be present in it?
What is the same about the electron structures of:
- Lithium, Sodium and Potassium.
- Beryllium, Magnesium and Calcium.
Answer briefly.
How was it shown that atom has empty space?
Why do \[\ce{^35_17{CI}}\] and \[\ce{^37_17{CI}}\] and have the same chemical properties? In what respect do these atoms differ?
Draw the structure of oxygen and sulphur atoms.
Calculate the number of neutrons, protons and electrons:
- atomic number 3 and mass number 7
- atomic number 92 and mass number 238.
What are nucleons? How many nucleons are present in Phosphorous? Draw its structure.
Answer in detail.
What conclusions were made from the observations of Gold foil experiment?
Explain the postulates of Bohr’s atomic model.
State the Gay Lussac’s law of combining volumes. Explain with an illustration.
Solutions for 11: Atomic Structure
Samacheer Kalvi solutions for Science [English] Class 9 TN Board chapter 11 - Atomic Structure
Shaalaa.com has the Tamil Nadu Board of Secondary Education Mathematics Science [English] Class 9 TN Board Tamil Nadu Board of Secondary Education solutions in a manner that help students grasp basic concepts better and faster. The detailed, step-by-step solutions will help you understand the concepts better and clarify any confusion. Samacheer Kalvi solutions for Mathematics Science [English] Class 9 TN Board Tamil Nadu Board of Secondary Education 11 (Atomic Structure) include all questions with answers and detailed explanations. This will clear students' doubts about questions and improve their application skills while preparing for board exams.
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Concepts covered in Science [English] Class 9 TN Board chapter 11 Atomic Structure are Atomic Number (Z), Mass Number (A), and Number of Neutrons (n), Valency, Electronic Configuration of Atom, Lord Rutherford’s Atomic model, Neils Bohr’s Model of an Atom, Discovery of Charged Particles in Matter, Neutrons (n), Atomic Mass, Isotopes, Isobars, Isotones or Isoneutronic, Laws of Chemical Combination, Law of Multiple Proportions, Law of Reciprocal Proportions, Quantum Numbers, Limitations of Rutherford’s Atomic Model, Structure of an Atom, Gay Lussac’s Law of Gaseous Volumes, Atoms: Building Blocks of Matter.
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