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Unit 2

Quiz by Clara Heyder

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9 questions
Show answers
  • Q1
    The net charge on a n aluminum ion is +3 because there are -
    13 protons and 10 neutrons in the nucleus
    10 protons and 13 electrons in the atom
    10 neutrons and 13 electrons in the atom
    13 protons and 10 electrons in the atom
    30s
  • Q2
    Potassium (K) has a smaller atomic mass than argon (Ar) even though the atomic number of potassium is larger than the atomic number of argon. Which of the following best accounts for this observation?
    At STP, potassium is in the solid phase, but argon is a gas.
    The most common isotopes of potassium have fewer neutrons than the most common isotopes of argon.
    The most common isotopes of argon have more protons than the most common isotopes of potassium
    It is easier for a potassium atom to lose an electron than it is for an argon atom.
    30s
  • Q3
    How many valence electrons does an oxygen atom have?
    6
    5
    7
    2
    30s
  • Q4
    Which of the following particles has a positive charge?
    neutron
    electron
    proton
    gama
    30s
  • Q5
    Protons and neutrons have approximately the same -
    group
    mass
    charge
    period
    30s
  • Q6
    Equal numbers of protons and electrons make the atom -
    mass
    positive
    neutral
    negative
    30s
  • Q7
    A chloride ion (Cl-) has the same number of electrons as a neutral atom of -
    sulfur
    argon
    flourine
    bromine
    30s
  • Q8
    A chemist is examining an unidentified element sample with oxidation states of +2, +3, and +6. The element has a shielding effect similar to that of potassium (K). Which statement about unidentified element is most likely true?
    It is a transition metal from the same period as potassium
    It is one of the heaviest elements in potassium's group.
    It is a mix of three unstable isotopes of potassium.
    It has the same number of neutrons as potassium.
    30s
  • Q9
    The elements that are characterized by the presence of an incomplete d sublevel are called -
    lanthanoids
    transition elements
    halogens
    alkali earth metals
    30s

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