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# Lesson #2: Atoms and the periodic table - PowerPoint PPT Presentation

Lesson #2: Atoms and the periodic table. Objective: Draw the electron shells of the first 20 elements. How to read an element on the periodic table. Remember: Protons are Heavy and Positively (+ ve ) Charged Neutrons are Heavy and Neutral

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### Lesson #2: Atoms and the periodic table

Objective:

Draw the electron shells of the first 20 elements

Remember:

Protons are Heavy and Positively (+ve) Charged

Neutrons are Heavy and Neutral

Electrons are Tiny and Negatively (-ve) Charged

• Electrons always occupy shells or energy levels

• The lowest energy levels are always filled first

• Only a certain number of electrons are allowed in each shell:

1st: 2 2nd: 8 3rd: 8 4th:16

In your notebook draw the outline of the periodic table using the first 20 elements.

Use a whole page horizontally.

At the top, write the name of the element.

In the middle of the box write the symbol (small),

Around the symbol we are going to draw the electrons together.

Let’s make the periodic table!

1. Your table must decide where to place your cards on the empty periodic table on the board.

2. When you’re finished be sure to sit down so that we know who the winners are.

Finish your atom using the first 20 elements.

You will be given an element.

You must add it’s electrons on using the wooden sticks and plasticine.

We will use your models later on for bonding