Earth Science
Name_____________________________
Chapter 8
Period_____________________________
Worksheet
Date______________________________
__________________________________________________________________________________
Isotopes
Parts of the Atom
1. Using the list of the terms below, correctly identify each lettered item in the following diagram. Write the
correct answers in the spaces at the right. (1 point)
A. _______________
Electron
B. _______________
Proton
C. _______________
Neutron
D. _______________
Electron Cloud
Isotope
2. In the space below, draw one isotope of the same element as above. Label all parts listed in question 1.
(1.5 points)
Questions (0.25 points each)
3. In your own words, explain what isotopes are.
4. How is the isotope that you drew for question 2 different from the atom shown in question 1? How are
the two alike?
5. What is the atomic number of the element shown in question 1? …in question 2?
6. What is the atomic mass number of the isotope in question 1? …in question 2?
7. Write the correct isotopic notation for Oxygen that has an atomic number of 8 and an atomic mass of 18.
8.
Write the correct isotopic notation for Carbon that has 6 protons and an atomic mass of 13.
9. Write the correct isotopic notation for Hydrogen that has 1 proton and 2 neutrons.
10. Write the correct isotopic notation for Nitrogen that has an atomic number of 7 and 8 neutrons.
Isotopes or Different Elements
In each of the following statements, you are given a pair of elements and important information about each. Use this information
to determine if the pair of elements are isotopes or different elements in the space provided. (0.1 points each)
1. ______________________ Element D has 6 protons and 7 neutrons.
Element F has 7 protons and 7 neutrons.
2. ______________________ Element J has 27 protons and 32 neutrons.
Element L has 27 protons and 33 neutrons.
3. ______________________ Element X has 17 protons and 18 neutrons.
Element Y has 18 protons and 17 neutrons.
4. ______________________ Element T has an atomic number of 20 and an atomic mass of 40.
Element Z has an atomic number of 20 and an atomic mass of 41.
5. ______________________ Element P has an atomic number of 92 and an atomic mass of 238.
Element S has 92 protons and 143 neutrons.