Journal Entry:

Models of a helium atom and a beryllium atom are shown above. The nucleus of each contains protons and neutrons. The electrons orbit the nucleus. 1. Compare the two models. List three similarities and three differences. 2. Based on the models, why do you think helium is number 2 and beryllium number 4 on the periodic table?

Learning Intentions

• We will learn how to describe the structure of an atom

• We will learn the difference between atomic number, atomic mass and average atomic mass

• We will learn how to extract information from the periodic table related to atomic structure and atomic mass.

Closing Task:

You can draw a simple atomic model of an atom for a specific element.

You can use the periodic table to identify an element based on atomic structure.

Content Standards being covered:

Students understand the structure of matter at the atomic level and the history that lead to our current understanding.