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TEKS Science Grade 8 - 8.5.A, 8.5B, 8.5C

Quiz by Makaila Eikanas

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

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24 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.
    300s
    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
    300s
    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.
    48
    300s
    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
    300s
    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.
    300s
    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
    300s
    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
    300s
    8.5a
  • Q8
    What is the mass number of a potassium (K) atom that has 20 neutrons?
    19
    18
    39
    20
    300s
    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
    300s
    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
    300s
    8.5a
  • Q11
    A researcher wants to experiment with an element that reacts like phosphorus (P) but has a greater atomic mass. Which element should the researcher select for the experiment? (Hint: Phosphorus wants to create a full outer shell.)
    Arsenic (As)
    Sulfur (S)
    Nitrogen (N)
    Silicon (Si)
    300s
  • Q12
    The periodic table is organized into groups and periods of elements. The characteristics of a certain group of elements are listed below. Which of these elements is in this group?
    Question Image
    Strontium
    Lithium
    Silicon
    Aluminum
    300s
  • Q13
    Which two elements on the periodic table are in the same period?
    Se and Te
    Sn and Rb
    K and Ba
    F and Cl
    300s
  • Q14
    Which pair of properties describes the elements in Group 18?
    They are magnetic and boil at low temperatures.
    They are chemically stable and liquid at room temperature.
    They are gaseous at room temperature and chemically stable.
    They have eight valence electrons and are flammable.
    300s
  • Q15
    A student is studying the ways different elements are similar to one another. Diagrams of atoms from four different elements are shown below. Which two atoms are of elements in the same group in the periodic table?
    Question Image
    Atom 3 and Atom 4
    Atom 1 and Atom 2
    Atom 2 and Atom 3
    Atom 1 and Atom 4
    300s

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