Chemistry Basics: Atomic Theory Quiz
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Questions and Answers

What is the mass number of an atom with 15 protons and 16 neutrons?

  • 32
  • 31 (correct)
  • 15
  • 16

    • Which of the following statements accurately describes isotopes?

  • Isotopes are atoms of different elements that have the same number of protons.
  • Isotopes are atoms of the same element that have the same number of protons and neutrons.
  • Isotopes are atoms of the same element that have the same number of protons but a different number of neutrons. (correct)
  • Isotopes are atoms of different elements that have the same number of neutrons but a different number of protons.

    • What is the atomic number of an atom with 20 protons and 22 neutrons?

  • 22
  • 44
  • 20 (correct)
  • 42

    • What is the symbol for an isotope of oxygen with 8 protons and 10 neutrons?

    <p>O-18 (B)</p> Signup and view all the answers

    Which of the following elements has 11 protons?

    <p>Sodium (Na) (D)</p> Signup and view all the answers

    What is the complete symbol for the Americium isotope used in smoke detectors?

    <p>$^{241}_{95}Am$ (D)</p> Signup and view all the answers

    What is the name of the element with the symbol 'He' and a mass number of 4?

    <p>Helium (D)</p> Signup and view all the answers

    Which of the following statements is TRUE about atomic theory?

    <p>Atoms combine in whole-number ratios to form compounds. (D)</p> Signup and view all the answers

    What is the complete symbol for the Carbon isotope used for radioactive dating of previously living material?

    <p>$^{14}_{6}C$ (D)</p> Signup and view all the answers

    What is the number of neutrons in an atom of chlorine (Cl) with a mass number of 37?

    <p>20 (B)</p> Signup and view all the answers

    Which of the following atoms has the smallest number of neutrons?

    <p>Lithium (D)</p> Signup and view all the answers

    Which of the following atoms has the largest number of protons?

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

    What is the atomic symbol for sodium?

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

    What is the name of the element with the atomic symbol Mn?

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

    Which of the following is NOT a characteristic of a molecule?

    <p>Molecules have no physical properties. (A)</p> Signup and view all the answers

    What is the molecular formula for a molecule with two hydrogen atoms and one oxygen atom?

    <p>H2O (C)</p> Signup and view all the answers

    What is the name of the molecule with the formula P2S5?

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

    What is the correct formula for carbon tetrachloride?

    <p>CCl4 (D)</p> Signup and view all the answers

    Which of the following prefixes is used to indicate eight atoms in a molecule?

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

    What is the correct formula for silicon dioxide?

    <p>SiO2 (D)</p> Signup and view all the answers

    If a molecule contains four atoms of a certain element, what prefix will be used in its name?

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

    What is the correct formula for iodine pentabromide?

    <p>IBr5 (D)</p> Signup and view all the answers

    Flashcards

    Atom

    The smallest piece of an element that maintains its identity.

    Atomic Number

    The number of protons in the nucleus of an atom; unique to each element.

    Isotopes

    Atoms of the same element with different numbers of neutrons.

    Mass Number

    The sum of protons and neutrons in an atomic nucleus.

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    Carbon-12

    An isotope of carbon with 6 protons and 6 neutrons.

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    Uranium-238

    An isotope of uranium with 92 protons and 146 neutrons.

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    Atomic Symbols

    Abbreviations used to represent elements and their isotopes.

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    Neutral Atom

    An atom with equal numbers of protons and electrons, overall charge is zero.

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    Numerical Prefixes

    Prefixes used to indicate the number of atoms in a molecule.

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    Mono

    Prefix meaning one; used for a single atom in a molecular formula.

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    Di

    Prefix meaning two; indicates two atoms of an element.

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    Tri

    Prefix meaning three; indicates three atoms of an element.

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    Tetra

    Prefix meaning four; indicates four atoms of an element.

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    Penta

    Prefix meaning five; indicates five atoms of an element.

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    Chemical Nomenclature Rule 1

    Identify the elements in the molecule from its formula.

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    Naming the Second Element

    Combine the numerical prefix, stem, and -ide suffix for the second element.

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    Molecule

    The smallest part of a substance that has its properties, made of two or more atoms.

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    Molecular Formula

    A formal listing of the types and numbers of atoms in a molecule.

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    Chemical Bond

    The connection between atoms in a molecule.

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    Element Names

    The names of chemical elements represented by their symbols.

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    Neutrons

    Neutral particles in an atom's nucleus, contributing to its mass.

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    Protons

    Positively charged particles found in the nucleus of an atom.

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    Study Notes

    Chemistry Basic: The Atomic Theory

    • Atoms are the smallest pieces of an element, maintaining its identity.
    • Atoms are composed of subatomic particles.
    • Modern Atomic Theory:
      • All matter is composed of atoms.
      • Atoms of the same element are identical, differing elements are different.
      • Atoms combine in whole-number ratios to form compounds.

    The Atom

    • Protons: Located in the nucleus, 1.6 x 10-27 kg, positive charge (1+).
    • Neutrons: Located in the nucleus, 1.6 x 10-27 kg, no charge.
    • Electrons: Orbiting the nucleus, 9.1 x 10-31 kg, negative charge (1-).

    Atomic Number

    • The number of protons in an atom's nucleus.
    • All atoms of the same element have the same number of protons.
    • Atoms of the same element can have a varying number of neutrons.

    Isotopes

    • Atoms of the same element with a different number of neutrons.
    • Mass number = sum of protons and neutrons in the nucleus.

    Atomic Symbols

    • Mass number (number of protons + neutrons) is shown as a superscript.
    • Atomic number (number of protons) is shown as a subscript.
    • Example: Carbon-12 (12C). Uranium-238 (238U).

    Periodic Table of Elements

    • Organises elements based on atomic number and properties.
    • Elements with similar properties are grouped.
    • Elements are arranged in rows (periods) and columns (groups).

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    Related Documents

    Chemistry Lecture 1 and 2: Chemistry Basics - Atomic Theory PDF

    Description

    Test your knowledge of the atomic theory and the structure of the atom with this engaging quiz. Explore the components of an atom, including protons, neutrons, and electrons, as well as concepts like isotopes and atomic numbers. Perfect for students learning the fundamentals of chemistry.

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