Atoms and Isotopes Worksheet



Atoms and Isotopes Worksheet

1. Fill in the table with the correct information.

|Isotope |Isotope Notation |Atomic # |Protons |Electrons |Neutrons |

|Oxygen-16 | | | | | |

|Bromine-80 | | | | | |

|Uranium-235 | | | | | |

|Copper-64 | | | | | |

2. Describe the general arrangement of subatomic particles in the atom.

3. What contribution did these scientists make to atomic models of the atom?

a. Dalton

b. Thomson

c. Rutherford

4. What is the isotope notation of the element that has an atomic number of 24 and a mass number of 52?

5. What part of the atom contains practically all its mass?

6. How do the isotopes of an element differ? How are they the same?

7. Which element contains the largest number of neutrons per atom?

a. Bismuth-210 b. Polonium-210 c. Astatine-210 d. Astatine-211

8. Fill in the following table.

|Isotope |Isotope Notation |Atomic # |Protons |Electrons |Neutrons |

|Nickel-58 | | | | | |

| | |15 | | |15 |

| | | | |53 |74 |

| | | |36 | |48 |

| | | | |34 |45 |

|Calcium-40 | | | | | |

|Chlorine-37 | | | | | |

9. Calculate the average atomic mass of chlorine if its isotopes and % abundances are as follows. Show all work.

Mass of Isotope % abundance

36.96590 24.47

34.96885 75.53

Atoms and Isotopes Worksheet

Fill in the table with the correct information

|Isotope |Isotope notation |Atomic # |Protons |Electrons |neutrons |

|Oxygen-16 | |8 |8 |8 |8 |

|Bromine-80 | |35 |35 |35 |45 |

|Uranium-235 | |92 |92 |92 |143 |

|Copper-64 | |29 |29 |29 |35 |

1. Describe the general arrangement of subatomic particles in the atom

Electrons surround the nucleus; protons and neutrons are in the nucleus.

2. What contribution did these scientists make to atomic models of the atom?

a. Dalton – 1st atomic theory

b. Thomson- electron

c. Rutherford- nucleus

3. What is the isotope notation of the element that has an atomic number of 24 and a mass number of 52.

4. What part of the atom contains practically all its mass? nucleus

5. How do the isotopes of an element differ? How are they the same?

They have different #s of neutrons; same number of protons

6. Which element contains the largest number of neutrons per atom?

a. Bismuth-210 b. Polonium-210 c. Astatine-210 d. Astatine-211

7. Fill in the following table

|Isotope |Isotope Not |Atomic # |Protons |Electrons |Neutrons |

|Nickel-58 | |28 |28 |28 |30 |

|Phosphorus-30 | |15 |15 |15 |15 |

|Iodine-127 | |53 |53 |53 |74 |

|Krypton-84 | |36 |36 |36 |48 |

|Selenium-79 | |34 |34 |34 |45 |

|Calcium-40 | |20 |20 |20 |20 |

|Chlorine-37 | |17 |17 |17 |20 |

8. Calculate the average atomic mass of chlorine if its isotopes and % abundance are as follows. Show work.

Mass of Isotope % abundance

36.96590 24.47 (.2447)(36.96590) = 9.04556

34.96885 75.53 (.7553)(34.96885) = 26.41200

35.4575amu

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