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TEKS Grade 8 Science - 8.5.B Protons and Electrons

Quiz by Texas Education Agency

Grade 8
Science (2017)
Texas Essential Knowledge and Skills (TEKS)

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9 questions
Show answers
  • Q1
    A model of an atom is shown below. An atom of which element is represented by this model?
    Question Image
    Sodium (Na)
    Neon (Ne)
    Carbon (C)
    Boron (B)
    60s
    8.5b
  • Q2
    When trying to identify an unknown element, a scientist determines what other elements the unknown element reacts with chemically. Which property of the unknown element determines the other elements it reacts with?
    The total number of particles in the nucleus of the unknown element
    The number of protons in the nucleus of the unknown element
    The total number of neutrons in the unknown element
    The number of valence electrons in the unknown element
    60s
    8.5b
  • Q3
    The atoms of a certain element each contain 11 protons and 1 valence electron. Which statement correctly identifies this element and describes its chemical reactivity?
    The element is sodium, and it is not very reactive.
    The element is sodium, and it is highly reactive.
    The element is fluorine, and it is not very reactive.
    The element is fluorine, and it is highly reactive
    60s
    8.5b
  • Q4
    A chemist is identifying the elements present in a sample of seawater. What characteristic of an element’s atoms always determines the element’s identity?
    The number of protons
    The number of valence electrons
    The number of neutrons
    The location of valence electrons
    60s
    8.5b
  • Q5
    A chemist made the table below to record some atomic properties of four elements. Based on the information in the table, which conclusion about the chemical reactivity of these elements is valid?
    Question Image
    Gallium is the most reactive because it has many more neutrons than protons.
    Fluorine is the most reactive because it has 7 electrons in the outer shell.
    Boron is the most reactive because it has the most protons.
    Silicon is the most reactive because it has an equal number of protons and neutrons.
    60s
    8.5b
  • Q6
    60s
    8.5b
  • Q7
    The table below lists three characteristics of an atom of an element. An atom of which element is described by the data in the table?
    Question Image
    Rubidium (Rb)
    Astatine (At)
    Radon (Rn)
    Cadmium (Cd)
    60s
    8.5b
  • Q8
    Four students were asked to name the parts of an atom that determine the atom’s identity and chemical properties. The students’ responses are shown in the table below. Which student’s responses are correct?
    Question Image
    Student 4
    Student 2
    Student 1
    Student 3
    60s
    8.5b
  • Q9
    Tin, Sn, is a soft white metal. It has a low melting point compared with other metals. Tin is widely used as a coating for cans of food. Which statement accurately describes atoms of tin?
    Tin atoms have 50 protons.
    Tin atoms have 119 neutrons.
    Tin atoms have five valence electrons.
    Tin atoms have 68 electrons.
    60s
    8.5b

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