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TEKS Grade 8 Science - 8.5.A The Structure of Atoms

Quiz by Texas Education Agency

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

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10 questions
Show answers
  • Q1
    Which of the following best describes an electron?
    It has a positive charge and much more mass than a neutron.
    It has a negative charge and about the same mass as a neutron.
    It has a negative charge and much less mass than a proton.
    It has no charge and about the same mass as a proton.
    60s
    8.5a
  • Q2
    An atom has 25 protons, 30 neutrons, and 25 electrons. What is the charge of the atom’s nucleus?
    30
    −25
    25
    −30
    60s
    8.5a
  • Q3
    An atom of a certain element has 36 protons, 36 electrons, and a mass number of 84. At room temperature this element is a very stable gas. How many neutrons are in this atom? Be sure to use the correct place value.
    Users enter free text
    Type an Answer
    60s
    8.5a
  • Q4
    In the early 1900s many scientists thought that an atom consisted of a positive substance with negative charges scattered throughout the substance. Then Ernest Rutherford completed an experiment that changed the concept of an atom. His discovery led to the understanding that an atom consists mostly of empty space with —
    electrons and protons orbiting a cloud of neutrons
    neutrons and protons orbiting a cloud of electrons
    protons orbiting a dense nucleus made of electrons and neutrons
    electrons orbiting a dense nucleus made of protons and neutrons
    60s
    8.5a
  • Q5
    Which statement correctly describes the location and charge of the electrons in an atom?
    The electrons are inside the nucleus and have a negative charge.
    The electrons are inside the nucleus and have no charge.
    The electrons are outside the nucleus and have no charge.
    The electrons are outside the nucleus and have a negative charge.
    60s
    8.5a
  • Q6
    What is the total number of protons, neutrons, and electrons in a cadmium, Cd, atom that has a mass number of 112? Be sure to use the correct place value.
    Users enter free text
    Type an Answer
    60s
    8.5a
  • Q7
    A model of a beryllium atom is shown below. What types of particles are found in the cloud surrounding the atom’s nucleus?
    Question Image
    Neutral particles and positively charged particles
    Negatively charged particles only
    Positively charged particles only
    Positively charged particles and negatively charged particles
    60s
    8.5a
  • Q8
    What is the mass number of a potassium (K) atom that has 20 neutrons?
    19
    18
    39
    20
    60s
    8.5a
  • Q9
    What is the difference between the number of electrons in an atom of selenium, Se, and the number of electrons in an atom of aluminum, Al? Be sure to use the correct place value.
    Users enter free text
    Type an Answer
    60s
    8.5a
  • Q10
    How many protons, neutrons, and electrons are present in an atom of hafnium, Hf, with a mass number of 178?
    72 protons, 178 neutrons, 106 electrons
    72 protons, 106 neutrons, 72 electrons
    178 protons, 250 neutrons, 72 electrons
    106 protons, 72 neutrons, 106 electrons
    60s
    8.5a

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