Chapter Exam

Chapter 4: Atomic Structure — Online MCQ Test

Q: Which of the following is the smallest particle of an element that retains its chemical properties?

Answer: A. Atom — An atom is the smallest unit of an element that retains the chemical properties of that element.

Q: Who proposed the nuclear model of the atom?

Answer: B. Ernest Rutherford — Ernest Rutherford proposed the nuclear model based on his gold foil experiment.

Q: Which part of an atom contains protons and neutrons?

Answer: B. Nucleus — The nucleus is the central part of the atom and contains protons and neutrons.

Q: Which of the following is the correct order from smallest to largest?

Answer: B. Electron, atom, molecule — An electron is a subatomic particle, an atom is larger than an electron, and molecules are formed by joining atoms.

Q: Which of the following statements about electrons is correct?

Answer: C. They revolve around the nucleus — Electrons move around the nucleus in shells or orbits in simple atomic models taught at this level.

SCIENCE · Samacheer Kalvi 7th · Tamil Nadu State Board

Practice Chapter 4: Atomic Structure with a free chapter-wise online MCQ test for Tamil Nadu State Board Samacheer Kalvi 7th SCIENCE. This chapter covers: Atom electron proton neutron Introduction to atoms molecules subatomic particles and atomic models. AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 4: Atomic Structure — Important Questions & Answers (FAQ)

Frequently asked questions from Tamil Nadu State Board Samacheer Kalvi 7th SCIENCE — Chapter 4: Atomic Structure, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which of the following is the smallest particle of an element that retains its chemical properties?

A. Atom ✓
B. Molecule
C. Cell
D. Compound

Answer: A. Atom
An atom is the smallest unit of an element that retains the chemical properties of that element.

Who proposed the nuclear model of the atom?

A. J. J. Thomson
B. Ernest Rutherford ✓
C. John Dalton
D. Neils Bohr

Answer: B. Ernest Rutherford
Ernest Rutherford proposed the nuclear model based on his gold foil experiment.

Which part of an atom contains protons and neutrons?

A. Electron shell
B. Nucleus ✓
C. Orbit
D. Molecule

Answer: B. Nucleus
The nucleus is the central part of the atom and contains protons and neutrons.

Which of the following is the correct order from smallest to largest?

A. Atom, molecule, element
B. Electron, atom, molecule ✓
C. Molecule, atom, electron
D. Element, atom, molecule

Answer: B. Electron, atom, molecule
An electron is a subatomic particle, an atom is larger than an electron, and molecules are formed by joining atoms.

Which of the following statements about electrons is correct?