Class 10: Atomic Structure and Properties
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Questions and Answers

What is the charge of a cation?

  • It has a positive charge. (correct)
  • It is neutral.
  • It has a negative charge.
  • It can have either a positive or negative charge. (correct)

    • What charge do the electrons of a calcium atom carry?

  • Variable charge.
  • Positive charge.
  • No charge.
  • Negative charge. (correct)

    • What happens to a calcium atom when it loses two electrons?

  • It becomes a calcium ion with a positive charge of +2. (correct)
  • It remains neutral.
  • It forms a calcium atom with a positive charge.
  • It becomes unstable and breaks down.

    • What does the atomic number represent?

    <p>The number of protons in the nucleus.</p> Signup and view all the answers

    What charge does the nucleus of an atom carry?

    <p>Positive charge.</p> Signup and view all the answers

    Study Notes

    Exercise 01: Classifying Objects

    • Classify objects into groups (metal, non-metal, etc.)
    • Materials listed: Zinc, Balloon, PVC, Chair, Stylus, Wood.

    Exercise 01: True or False

    • A cation has a positive charge
    • An atom is negatively charged
    • Copper is reddish-brown in color
    • Aluminum is attracted to magnets.

    Exercise 01: Atomic Structure

    • Atoms are made of a nucleus, electrons, and a surrounding cloud
    • The nucleus contains a positive charge (protons)
    • The number of positive charges is called the atomic number
    • Electrons surround the nucleus (negative charge)

    Exercise 02: Calcium Atom

    • Atomic number (Z) of Calcium (Ca) is 20
    • Calculate the charge of electrons in Coulombs
    • Calculate the charge of the nucleus in Coulombs
    • Calcium can lose two electrons, forming a Ca2+ ion
    • Calculate the charge of the Ca2+ ion in Coulombs
    • Formula for the Ca2+ ion is Ca²⁺

    Exercise 03: Electrical Properties of Materials

    • Two materials (A and B) are part of an electrical wire.
    • The wire is magnified showing material B.
    • Material B's electrical conductivity needs to be determined.
    • Material A emits a green flame when heated.

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    Description

    This quiz covers various aspects of atomic structure, classification of materials, and the properties of elements. Students will classify objects based on their material types, evaluate true or false statements about atomic charges, and explore the specific properties of calcium atoms. Prepare to enhance your understanding of chemistry fundamentals.

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