Structure of Atom: Chapter 2 Quiz
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Questions and Answers

What is the atomic number or charge number related to?

  • Number of protons (correct)
  • Number of electrons
  • Number of neutrons
  • Number of protons and neutrons

Which subatomic particles are found in the nucleus of an atom?

  • Electrons
  • Neutrons and electrons
  • Protons and neutrons (correct)
  • Protons and electrons

In a free state, how does the atom generally exist?

  • As a single particle
  • As a combination of protons and electrons
  • As a molecule (correct)
  • As a combination of protons, neutrons, and electrons

What did J.J. Thomson's experiments in 1897 reveal about atoms?

<p>Presence of electrons in atoms (B)</p> Signup and view all the answers

What does the atomic mass of an element represent?

<p>Number of protons and neutrons (C)</p> Signup and view all the answers

What did J.J. Thomson use to detect incident rays in his cathode ray tube?

<p>A layer of phosphorescent paint (D)</p> Signup and view all the answers

How did Thomson determine the charge-to-mass ratio (e/m) of cathode rays?

<p>By measuring their deflection under a magnetic field and their kinetic energy (D)</p> Signup and view all the answers

What is the formula for the force experienced by a charged particle in an electric field E?

<p>$FE = qE = - eE$ (B)</p> Signup and view all the answers

What is the formula for the kinetic energy K.E. of an electron?

<p>$K.E. = (1/2).m.v^2$ (A)</p> Signup and view all the answers

What force is sometimes called fluid resistance in Millikan's experiment?

<p>$Fs=6Πηr.v$ (drag force or stock force) (D)</p> Signup and view all the answers

Flashcards

Atomic Number

The number of protons in an atom's nucleus.

Protons and Neutrons

The particles found in the nucleus of an atom.

Molecule

The common state of an atom when it's not bound to other atoms.

Electrons in Atoms

J.J. Thomson's experiments in 1897 proved the existence of electrons.

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Atomic Mass

Represents the total number of protons and neutrons in an element's atom.

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Phosphorescent Paint

A phosphorescent material used in Thomson's cathode ray tube experiments to detect incident rays.

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Charge-to-Mass Ratio (e/m)

The ratio of an electron's charge to its mass (e/m).

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Force in an Electric Field

The force experienced by a charged particle in an electric field E, where q is the charge and E is the electric field strength.

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Kinetic Energy of an Electron

The energy possessed by an object due to its motion, where m is the mass and v is the velocity.

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Drag Force

A force that opposes the motion of a particle through a fluid (like air or water).

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