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![Samacheer Kalvi solutions for Science - Term 1 [English] Class 7 TN Board chapter 4 - Atomic Structure - Shaalaa.com](/images/science-term-1-english-class-7-tn-board_6:5f2b1b2038084cf381bfa42c826a928c.jpg "Samacheer Kalvi solutions for Science - Term 1 [English] Class 7 TN Board chapter 4 - Atomic Structure")
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Solutions for Chapter 4: Atomic Structure
Below listed, you can find solutions for Chapter 4 of Tamil Nadu Board of Secondary Education Samacheer Kalvi for Science - Term 1 [English] Class 7 TN Board.
Samacheer Kalvi solutions for Science - Term 1 [English] Class 7 TN Board 4 Atomic Structure Evaluation [Pages 51 - 52]
Choose the appropriate answer.
The basic unit of matter is ______.
element
atom
molecule
electron
The sub-atomic particle which revolves around the nucleus is ______.
atom
neutron
electron
proton
______ is positively charged.
Proton
Electron
Molecule
Neutron
The atomic number of an atom is the ______.
number of neutrons
number of protons
total number of protons and neutrons
number of atoms
Nucleons comprises of______.
protons and electrons
neutrons and electrons
protons and neutrons
neutrons and positron
Fill in the blank.
The smaller particles found in the atom is called ______.
The nucleus has _____ and _____
The _____ revolve around the nucleus.
If the valency of carbon is 4 and that of hydrogen is 1, then the molecular formula of methane is ______.
There are two electrons in the outermost orbit of the magnesium atom. Hence, the valency of magnesium is ______.
Match the following.
| 1. | Valency | Fe |
| 2. | Neutral particle | Proton |
| 3. | Iron | Electrons in the outermost orbit |
| 4. | Hydrogen | Neutron |
| 5. | Positively charged particle | Monovalent |
State true or false. If false, correct the statement.
The basic unit of an element is molecule.
True
False
State true or false. If false, correct the statement.
The electrons are positively charged.
True
False
State true or false. If false, correct the statement.
An atom is electrically neutral.
True
False
State true or false. If false, correct the statement.
The nucleus is surrounded by protons.
True
False
Complete the analogy.
Sun: Nucleus:: Planets: ______.
Atomic number : ______ :: Mass number : Number of protons and neutrons.
K: Potassium:: C: ______.
Consider the following statements and choose the correct option.
Assertion: An atom is electrically neutral.
Reason: Atoms have equal number of protons and electrons.
Assertion: The mass of an atom is the mass of its nucleus.
Reason: The nucleus is at the centre.
Assertion: The number of protons or the number of neutrons is known as atomic number.
Reason: The mass number is the sum of protons and neutrons.
Answer very briefly.
Define – Atom.
Name the sub-atomic particles.
What is atomic number?
What are the characteristics of proton?
Why neutrons are called neutral particles?
Answer briefly.
Distinguish isotopes from isobars.
What are isotones? Give one example.
Differentiate mass number from atomic number.
The atomic number of an element is 9, it has 10 neutrons. Find the element from the periodic table. What will be its mass number?
Answer in detail.
Draw the structure of an atom and explain the position of the sub-atomic particles.
The atomic number and the mass number of an element is 26 and 56 respectively. Calculate the number of electrons, protons and neutrons in its atom. Draw the structure.
What are nucleons? Why are they called so? Write the properties of the nucleons.
Define valency. What is the valency of the element with atomic number 8? What is the compound format by this element with hydrogen?
Higher Order Thinking Skills.
An atom of an element has no electron. Will that atom have any mass or not? Can an atom exist without electron? If so then give example.
What is common salt? Name the elements present in it. Write the formula of common salt. What are the atomic number and the mass number of the elements? Write the ions in the compound.
Project.
To have an idea of what atoms are, students can be asked to construct atoms using pipe cleaners (thin metal wires-electron shells), pompoms (balls-different colours for protons and neutrons) and beads (electrons). Students will love and enjoy putting them together and they look great hanging from the ceiling in the classroom.
Solutions for 4: Atomic Structure
Samacheer Kalvi solutions for Science - Term 1 [English] Class 7 TN Board chapter 4 - Atomic Structure
Shaalaa.com has the Tamil Nadu Board of Secondary Education Mathematics Science - Term 1 [English] Class 7 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 - Term 1 [English] Class 7 TN Board Tamil Nadu Board of Secondary Education 4 (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 - Term 1 [English] Class 7 TN Board chapter 4 Atomic Structure are Dalton’s Atomic Theory, J. J. Thomson’s Atomic Model, Atoms: Building Blocks of Matter, Advantages and Limitations of Dalton’s Atomic Theory, Advantage and Limitations of Thomson’s Atomic Model, Lord Rutherford’s Atomic model, Limitations of Rutherford’s Atomic Model, Structure of an Atom, Atomic Number (Z), Mass Number (A), and Number of Neutrons (n), Isotopes, Isobars, Atoms: Building Blocks of Matter, Valency.
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