Atoms, Compounds, And Elements Pretest

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Pretest Quizzes & Trivia

This quiz is a pretest to the physical science unit (8th grade level) which covers atomic theory, atomic structure, molecules, compounds, and elements.


Questions and Answers
  • 1. 

    What contribution to the atomic theory did Neils Bohr make?

    • A.

      He discovered the electron.

    • B.

      He theorized a model of atomic structure

    • C.

      He discovered the proton.

    • D.

      He viewed an atom for the first time using an instrument.

    Correct Answer
    B. He theorized a model of atomic structure
    Explanation
    Neils Bohr made a significant contribution to the atomic theory by theorizing a model of atomic structure. His model, known as the Bohr model, proposed that electrons orbit the nucleus in specific energy levels or shells. This model explained the stability of atoms and the emission and absorption of energy by electrons. Bohr's model laid the foundation for understanding the behavior of electrons in atoms and contributed to the development of quantum mechanics.

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  • 2. 

    Which of the following are parts of an atom? (Choose all that apply)

    • A.

      Neutron

    • B.

      Compound

    • C.

      Electron

    • D.

      Nucleus

    • E.

      Atomic bond

    • F.

      Proton

    • G.

      Element

    • H.

      Electron shell

    Correct Answer(s)
    A. Neutron
    C. Electron
    D. Nucleus
    F. Proton
    H. Electron shell
    Explanation
    The parts of an atom include the neutron, electron, nucleus, proton, and electron shell. The neutron is a subatomic particle that has no charge, while the electron is a negatively charged particle that orbits the nucleus. The nucleus is the central part of an atom that contains protons and neutrons. Protons are positively charged particles found in the nucleus. The electron shell is the region surrounding the nucleus where electrons are found. Therefore, all of these options are correct.

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  • 3. 

    Where in the atom are the electrons found?

    • A.

      Inside the nucleus

    • B.

      Outside the nucleus

    • C.

      Orbitting through the nucleus

    Correct Answer
    B. Outside the nucleus
    Explanation
    Electrons are found outside the nucleus of an atom. They orbit around the nucleus in specific energy levels or shells. These shells are arranged in increasing energy levels, with the innermost shell being closest to the nucleus. The electrons are negatively charged particles and are attracted to the positively charged protons in the nucleus. However, they are also repelled by each other, which causes them to occupy different energy levels and maintain a certain distance from the nucleus. This arrangement of electrons outside the nucleus is what gives atoms their chemical properties and allows for the formation of chemical bonds.

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  • 4. 

    What makes an atom able to form a compound?

    • A.

      Same number of protons as electrons

    • B.

      Different number of neutrons than protons

    • C.

      Unfilled outer electron shells

    • D.

      A positive or negative charge of the nucleus

    Correct Answer
    C. Unfilled outer electron shells
    Explanation
    Atoms are able to form compounds when they have unfilled outer electron shells. This is because atoms are constantly seeking stability, and having unfilled outer electron shells makes them more likely to interact with other atoms in order to achieve a full outer shell. By forming compounds, atoms can share, gain, or lose electrons to achieve a stable electron configuration, ultimately increasing their stability and reducing their reactivity.

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  • 5. 

    What charge does the nucleus of the atom have?

    • A.

      Positive

    • B.

      Neutral

    • C.

      Negative

    Correct Answer
    A. Positive
    Explanation
    The nucleus of an atom contains positively charged particles called protons. These protons have a positive charge, which is balanced by an equal number of negatively charged electrons in the electron cloud surrounding the nucleus. Therefore, the correct answer is positive, as the nucleus carries a positive charge.

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  • 6. 

    Which scientists was the first to use the term "atom"?

    • A.

      Democritus

    • B.

      John Dalton

    • C.

      JJ Thomson

    • D.

      Albert Einstein

    Correct Answer
    B. John Dalton
    Explanation
    John Dalton was the first scientist to use the term "atom." He proposed the atomic theory in the early 19th century, which stated that all matter is composed of small, indivisible particles called atoms. Dalton's theory revolutionized the understanding of chemistry and laid the foundation for modern atomic theory. His work paved the way for further scientific discoveries and advancements in the field of atomic research.

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  • 7. 

    How does an isotope differ from another atom of the same element?

    • A.

      The number of neutrons is different

    • B.

      The number of protons is different

    • C.

      The number of electrons is different

    • D.

      The shape is different

    Correct Answer
    A. The number of neutrons is different
    Explanation
    Isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons. This means that the atomic mass of isotopes varies due to the differing number of neutrons. Therefore, the correct answer is that the number of neutrons is different between isotopes of the same element.

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  • 8. 

    A pure substance that cannot be separated into simpler substances is called a(n)

    • A.

      Isotope

    • B.

      Atom

    • C.

      Element

    • D.

      Compound

    Correct Answer
    C. Element
    Explanation
    An element is a pure substance that cannot be separated into simpler substances. It consists of only one type of atom, which cannot be broken down into smaller particles by chemical means. Isotopes are different forms of the same element that have the same number of protons but different numbers of neutrons. Atoms are the basic units of matter, but they can combine to form compounds. Therefore, the correct answer is element.

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  • 9. 

    A pure substance that is composed of two or more elements that are chemically combined is a(n)

    • A.

      Isotope

    • B.

      Atom

    • C.

      Element

    • D.

      Compound

    Correct Answer
    D. Compound
    Explanation
    A pure substance that is composed of two or more elements that are chemically combined is called a compound. In a compound, the elements are bonded together in a fixed ratio and cannot be separated by physical means. Isotopes are forms of an element with different numbers of neutrons, atoms are the basic units of matter, and elements are substances made up of only one type of atom. Therefore, compound is the correct answer as it best describes a pure substance composed of chemically combined elements.

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  • 10. 

    The particle(s) that make up the mass of an atom is (are)

    • A.

      Electrons

    • B.

      Neutrons

    • C.

      Protons

    • D.

      Electron shells

    Correct Answer(s)
    B. Neutrons
    C. Protons
    Explanation
    The mass of an atom is made up of neutrons and protons. Neutrons have a neutral charge and are located in the nucleus of an atom along with protons, which have a positive charge. Electrons, on the other hand, have a negative charge and are found in electron shells surrounding the nucleus. Therefore, while electrons and electron shells are important components of an atom, they do not contribute to its mass.

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  • Current Version
  • Mar 21, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Jun 21, 2013
    Quiz Created by
    Traciwilliams
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