Practice Problems: The Atom

  1. How many electrons, protons and neutrons are there in the following atoms:

    a. 40Ca

    b. 119Sn

    c. 244Pu

  2. What are the mass numbers for the following atoms:

    a. beryllium with 5 neutrons

    b. titanium with 26 neutrons

    c. gallium with 39 neutrons

  3. Give the atomic symbol for each of the following elements using the format .

    a. sodium with 12 neutrons

    b. argon with 21 neutrons

    c. lead with 126 neutrons

  4. How many protons, neutrons and electrons are contained in a neutral ruthenium-101 atom?

  5. Fill in the blanks in the following table (each column in the table represents a different element). Assume each atom is uncharged.



    Number of protons

    Number of neutrons

    Number of electrons

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