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Inorganic Chemistry: Electronic Structure of the Atom Introduction
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Inorganic Chemistry: Electronic Structure of the Atom Introduction

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Questions and Answers

Who was the English scientist who came up with the atomic theory in 1803?

  • Isaac Newton
  • John Dalton (correct)
  • Charles Darwin
  • Albert Einstein

    • What is the meaning of the Greek word atomas from which 'atom' is derived?

  • Indivisible (correct)
  • Infinite
  • Fluid
  • Massive

    • What did Dalton call the simplest units of compounds in his atomic theory?

  • Elements
  • Molecules (correct)
  • Particles
  • Atoms

    • According to Dalton's atomic theory, what happens to atoms themselves when they combine in chemical reactions?

    <p>No change occurs to the atoms themselves</p> Signup and view all the answers

    What did Dalton explain in his theory regarding the structure of compounds?

    <p>The fixed structure of compounds</p> Signup and view all the answers

    What was one of Dalton's major contributions to science?

    <p>Proposing the atomic theory</p> Signup and view all the answers

    What did Michael Faraday's experiments in 1834 reveal about matter?

    <p>Matter has an electrical nature</p> Signup and view all the answers

    What prompted scientist Stoney to assume the existence of particles called electrons?

    <p>Observation of chemical changes due to electricity</p> Signup and view all the answers

    How was the electron discovered by scientist Thomson in 1897?

    <p>Using a cathode ray tube and observing deflection due to an electric field</p> Signup and view all the answers

    What did Thomson calculate from the magnitude of the electric field and the magnetic field?

    <p>The charge-to-mass ratio of the electron (e/m)</p> Signup and view all the answers

    What happened when a magnetic field passed perpendicular to the electric field?

    <p>The electrons were deflected in a direction opposite to their original deflection</p> Signup and view all the answers

    What effect did stopping the passage of electric current have on the electron beam?

    <p>The beam deflected under the influence of the magnetic field</p> Signup and view all the answers

    What did Thomson find when he applied an electric current through two plates until the electron beam returned to its original straight path?

    <p>The charge-to-mass ratio (e/m) value of the electron</p> Signup and view all the answers

    What did experiments at the end of the nineteenth century focus on?

    <p>Studying the passage of electric current in gas-evacuated tubes</p> Signup and view all the answers

    What does Michael Faraday's 1834 experiment show about chemical changes?

    <p>Chemical changes can occur when electricity is passed through aqueous solutions</p> Signup and view all the answers

    What did Michael Faraday's experiments show about atoms and molecules?

    <p>Atoms can form molecules in simple ratios</p> Signup and view all the answers

    The atomic number of cobalt supported the existence of a new relationship between the arrangement of elements based on their atomic numbers and their properties.

    <p>True</p> Signup and view all the answers

    Goldstein observed a positive ray inside a cathode ray tube and proved that it was a positive particle with a charge equal to the charge of the electron.

    <p>False</p> Signup and view all the answers

    Chadwick confirmed the existence of neutrons by observing the emission of high-energy particles that carried a charge.

    <p>False</p> Signup and view all the answers

    The number of neutrons in an atom can be calculated by subtracting the mass number from the atomic number.

    <p>True</p> Signup and view all the answers

    All atoms of an element have the same number of protons and neutrons.

    <p>False</p> Signup and view all the answers

    Moseley discovered X-rays in 1895.

    <p>False</p> Signup and view all the answers

    Moseley noticed that the collision of cathode rays in the X-ray tube of different elements gave the same energies.

    <p>False</p> Signup and view all the answers

    Moseley concluded that the number of positive charges in the nucleus decreases from one atom to another by individual electronic units.

    <p>False</p> Signup and view all the answers

    The atomic number of nickel is lower than the atomic number of cobalt.

    <p>False</p> Signup and view all the answers

    Moseley calculated the nucleus charge for the calcium atom to be +22.

    <p>False</p> Signup and view all the answers

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