Atomic And Molecular Structure

20 Questions

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Atomic Structure Quizzes & Trivia

Multiple choice quiz on atomic and molecular structure and ions.


Questions and Answers
  • 1. 
    • A. 

      Protons are found in the nucleus and are positively charged particles

    • B. 

      Electrons move around the nucleus and contribute little to the mass of the atom

    • C. 

      Neutrons are found in the nucleus and they have no charge

    • D. 

      The numbers of neutrons, protons and electrons are always equal in a neutral atom

  • 2. 
    Mass number refers to:
    • A. 

      The number of protons in the nucleus of an atom.

    • B. 

      The number of electrons in an atom.

    • C. 

      The number of neutrons in an atom.

    • D. 

      The total number of protons and neutrons in the nucleus of an atom.

  • 3. 
    Atoms of the same element which have the same number of protons but a different number of neutrons are known as
    • A. 

      Ions.

    • B. 

      Isotopes.

    • C. 

      Neutral atoms.

    • D. 

      A chemical family.

  • 4. 
    Which of the following determines the size of an atom?
    • A. 

      The number of protons in the atom.

    • B. 

      The number of neutrons in the atom.

    • C. 

      The size of the nucleus of the atom.

    • D. 

      The number of electrons in the atom.

  • 5. 
    The electron configuration:  2, 8, 4 is that of:
    • A. 

      Carbon

    • B. 

      Nitrogen

    • C. 

      Neon

    • D. 

      Silicon

  • 6. 
    The electron configuration for Al3+ is
    • A. 

      2, 8, 3

    • B. 

      2, 8

    • C. 

      2, 8, 6

    • D. 

      2, 8, 2

  • 7. 
    Which of the following is the most important factor in determining the chemical properties of an element?
    • A. 

      The total number of electrons in its atoms.

    • B. 

      The number of protons in the nucleus of its atoms.

    • C. 

      The number of neutrons in the nucleus of its atoms.

    • D. 

      The number of valence electrons in its atoms.

  • 8. 
    The number of valence electrons in an atom is equal to
    • A. 

      The number of electrons in the atom.

    • B. 

      The charge on a positive or negative ion formed by that atom.

    • C. 

      The number of electrons in the outer energy level of the atom.

    • D. 

      The number of electrons needed to fill all the energy levels of the atom.

  • 9. 
    An element, X, has the following electron configuration:    2,  5The atomic number of element X would be:
    • A. 

      2

    • B. 

      5

    • C. 

      7

    • D. 

      3

  • 10. 
    An element, X, has the following electron configuration:    2,  5The number of valence electrons in element X is
    • A. 

      2

    • B. 

      5

    • C. 

      7

    • D. 

      3

  • 11. 
    The number of valence electrons in the Group 2 elements of the Periodic Table is
    • A. 

      2

    • B. 

      4

    • C. 

      6

    • D. 

      8

  • 12. 
    Which of the following species does NOT have a stable electron configuration (i.e. like those of an inert gas)?
    • A. 

      Cl-

    • B. 

      K+

    • C. 

      Al3+

    • D. 

      Mg+

  • 13. 
    If an element has the electron configuration:  2,  8,  2  then it would most likely form an ion of charge
    • A. 

      +2

    • B. 

      -2

    • C. 

      +6

    • D. 

      -6

  • 14. 
    Which one of the following statements about atomic structure is TRUE?
    • A. 

      The numbers of protons, neutrons and electrons is always equal in a neutral atom.

    • B. 

      The numbers of protons and neutrons are always equal in a neutral atom.

    • C. 

      The numbers of neutrons and electrons are always equal in a neutral atom.

    • D. 

      The numbers of protons and electrons are always equal in a neutral atom.

  • 15. 
    Electrons are thought to be located in distinct energy levels or shells in an atom. The maximum number of electrons which can be found in the third (n=3) shell of an atom is:
    • A. 

      2

    • B. 

      8

    • C. 

      18

    • D. 

      36

  • 16. 
    Which one of the following is the most important factor that determines the chemical properties of an element?
    • A. 

      The number of protons in the nucleus of the atom.

    • B. 

      The total number of electrons in the atom.

    • C. 

      The number of valence electrons in the atom.

    • D. 

      The number of neutrons in the nucleus of the atom.

  • 17. 
    • A. 

      AB

    • B. 

      A2B

    • C. 

      AB2

    • D. 

      A3B

  • 18. 
    Consider three elements A ,B and C which have atomic numbers less than 20. The atomic number of A and B are x and (x-3) respectively. Element A forms cations with formula A+ and forms a solid substance AC when it reacts with element C.Which one of the following elements could  be A?
    • A. 

      Li

    • B. 

      Na

    • C. 

      Cl

    • D. 

      O

  • 19. 
    Consider three elements A ,B and C which have atomic numbers less than 20. The atomic number of A and B are x and (x-3) respectively. Element A forms cations with formula A+ and forms a solid substance AC when it reacts with element C.Which one of the following elements could be B?
    • A. 

      Li

    • B. 

      Na

    • C. 

      Cl

    • D. 

      O

  • 20. 
    Consider three elements A ,B and C which have atomic numbers less than 20. The atomic number of A and B are x and (x-3) respectively. Element A forms cations with formula A+ and forms a solid substance AC when it reacts with element C.The most likely type of bond formed between A and B would be:
    • A. 

      Metallic bonds

    • B. 

      Covalent bonds.

    • C. 

      Ionic bonds.

    • D. 

      Hydrogen bonds.