Week 11 October 11, 2018 Isotopes and Ions

This week we added to our understanding of Atomic Theory. Last week, we began our discussions with a review of what a neutral atom is and how we can use a Bohr model to design various elements we find on the periodic table. We watched a short video on isotopes as well (see below) and discussed how we differentiate between various isotopes of an element. Using the Bohr model, we determined that isotopes vary based upon differences in the number of neutrons they have. Thus, different isotopes have different mass numbers. We distinguish between isotopes by mass number.

Students were given a worksheet that also served as their graphic organizer. They were able to work independently. They colored-coded the subatomic particles of various isotopes and practiced isotopic notation as well as determining the mass number and atomic number of the isotopes. Below is a copy of the worksheet.

Isotopes Worksheet/Graphic Organizer

Below are the notes on isotopes.

Next, we reviewed a neutral atom using our Bohr model of carbon as an example and discussed defined ions--more specifically, anions and cations. We also discussed the significance of valence electrons--the outermost shell electrons that are gained or lost. Below are the notes for ions.

Students worked on a second worksheet that gave them practice determining the number of electrons, protons, and neutrons were in elements. I was given the opportunity to work with students individually to help them fill in gaps in their understanding and clarify the concepts taught.

The key for the worksheet is shown below. They were asked to glue the worksheet in their notebooks as a graphic organizer for Ions.

Next week, we will be taking a closer look at the periodic table.