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Atoms, Ions, Isotopes

Quiz by Kelli Hornberger

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25 questions
Show answers
  • Q1
    24.1% of all the isotopes of a an element have a mass of 75.23 amu, 48.7% have a mass of 74.61 amu, and 27.2% have a mass of 75.20 amu. What is the average mass of this element?
    75.01 amu
    74.92 amu
    24.97 amu
    74.51 amu
    30s
  • Q2
    Nitrogen has three occurring isotopes: Nitrogen-13, Nitrogen-14, Nitrogen-15. The average atomic mass of nitrogen is 14.01. Which isotope is the most abundant?
    Based on the information given, it cannot be determined
    Nitrogen-15
    Nitrogen-13
    Nitrogen-14
    30s
  • Q3
    Cations are...
    Neutral
    Positive
    Negative
    30s
  • Q4
    Cations are _______ that form ____________ ions and __________ electrons.
    metals, positive, lose
    nonmetals, negative, gain
    nonmetals, positive, lose
    metals, positive, gain
    30s
  • Q5
    Anions are _______ that form ____________ ions and __________ electrons.
    nonmetals, negative, gain
    metals, positive, gain
    nonmetals, positive, lose
    metals, positive, lose
    30s
  • Q6
    What is the charge of an atom that has gained one electron?
    -1
    +2
    +1
    -2
    30s
  • Q7
    Anions are...
    Neutral
    Positive
    Negative
    30s
  • Q8
    The mass number of an element that has 18 protons, 18 electrons, and 19 neutrons is _____.
    12.5
    25
    37
    13
    30s
  • Q9
    The atomic number of an element that has 9 protons, 9 electrons, and 10 neutrons is _____.
    10
    19
    9
    28
    30s
  • Q10
    If the number of electrons in an atom changes you make a(n) __________________.
    isomer
    ion
    isotope
    new element
    30s
  • Q11
    How many neutrons does uranium-239 have?
    147
    92
    331
    239
    30s
  • Q12
    Which particle contributes least to the total mass of an atom?
    nucleus
    electron
    proton
    neutron
    30s
  • Q13
    What term most correctly describes the following: Atomic Number: 26 Neutrons: 30 Electrons: 25
    Isotope
    Cation
    Anion
    Neutral Atom
    30s
  • Q14
    Which statement about subatomic particles is true?.
    Unlike protons or neutrons, electrons have no mass.
    An electron has far less mass than either a proton or neutron
    Neutrons have no charge and no mass.
    Protons, neutrons, and electrons all have about the same mass.
    30s
  • Q15
    Which statement is true about oxygen-17 and oxygen-18?
    They have the same mass number.
    They do not have the same number of protons.
    They are isotopes of oxygen.
    Their atoms have an identical mass.
    30s

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