Easy algebra 2 assignment


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Objectives: Student will be able to:

Use the periodic table to obtain information about an element IOT determine the number of each of the subatomic particles in a particular isotope.


Do Now/Motivation: What information can you obtain from the periodic table?


Atomic Structure and the Periodic Table


Mass number = number of protons + number of neutrons

Atomic number = number of protons = number of electrons in a neutral atom.

Atomic numbers can be found on the Periodic Table as depicted in the diagram below;


  1. Find the number of protons, neutrons, and electrons in each of the atoms below

What do these two atoms have in common? What is different about them?



Based upon the problem above, define the term isotope? Watch this 2 minutes video Here to help you understand the meaning of an Isotope. Here is a Phet simulation of mass number and Isotopes.




Isotope – an element that has the same number of protons (or same atomic number) but, has a different number of neutrons (or a different mass number).



  1. Hydrogen has three isotopes. They are Hydrogen-1 (protium), Hydrogen-2 (deuterium) and Hydrogen-3 (tritium).

Draw the symbols for each.

How do they compare in their number of protons, neutrons, and electrons?


Activity Sheet


  1. Complete the following chart by filling in the appropriate numbers.



Isotope Number of


Number of


Number of







Note: 14C is the same as



  1. Define Isotope.

Compare the following isotopes in terms of their number of protons, neutrons, and electrons:




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