Atomic Structure Quiz for Class 9
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Questions and Answers

What is the smallest unit of an element?

  • Atom (correct)
  • Compound
  • Cell
  • Molecule

What is the central part of an atom called?

  • Proton
  • Neutron
  • Nucleus (correct)
  • Electron

What is the total number of protons and neutrons in an atom called?

  • Atomic number
  • Isotope
  • Mass number (correct)
  • Electron configuration

Which scientist is credited with discovering the electron?

<p>J.J. Thomson (D)</p> Signup and view all the answers

Which subatomic particle has a negative charge?

<p>Electron (B)</p> Signup and view all the answers

What is the outermost shell of an atom called?

<p>Valence shell (A)</p> Signup and view all the answers

What is the term for atoms of the same element with different numbers of neutrons?

<p>Isotope (A)</p> Signup and view all the answers

What is the term for an atom or molecule with a net electric charge due to the loss or gain of one or more electrons?

<p>Ion (B)</p> Signup and view all the answers

How many orbital shells are there in an atom according to the Bohr model?

<p>4 (C)</p> Signup and view all the answers

What is the term for the process where an atom gains or loses electrons to form charged particles (ions)?

<p>Ionization (C)</p> Signup and view all the answers

Flashcards

Atom

The smallest unit of an element that maintains the chemical properties of that element.

Nucleus

The small, dense, positively charged center of an atom.

Proton

A positively charged subatomic particle found in the nucleus of an atom.

Neutron

A neutral subatomic particle found in the nucleus of an atom.

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Electron

A negatively charged subatomic particle that orbits the nucleus.

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Atomic number

The number of protons in the nucleus of an atom.

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Element

A substance composed of atoms with the same atomic number.

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Atomic mass

The mass of an atom, approximately equal to the number of protons and neutrons.

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Subatomic Particles

Particles smaller than an atom.

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Electron shell

A region around the nucleus where electrons orbit.

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Study Notes

Atomic structure

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Description

Test your knowledge of atomic structure concepts with this quiz designed for Class 9 students. Questions cover topics such as atomic models, subatomic particles, and the periodic table.

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