# Periodic Table Study Guide - PowerPoint PPT Presentation

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Periodic Table Study Guide. How to Draw Bohr Diagrams. Bohr Diagrams. Find your element on the periodic table. Determine the number of electrons – it is the same as the atomic number. This is how many electrons you will draw. Bohr Diagrams. Find out which period (row) your element is in.

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Periodic Table Study Guide

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## Periodic Table Study Guide

How to Draw Bohr Diagrams

### Bohr Diagrams

• Find your element on the periodic table.

• Determine the number of electrons – it is the same as the atomic number.

• This is how many electrons you will draw.

### Bohr Diagrams

• Find out which period (row) your element is in.

• Elements in the 1st period have one energy level.

• Elements in the 2nd period have two energy levels, and so on.

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### Bohr Diagrams

• Draw a nucleus with the element symbol inside.

• Carbon is in the 2nd period, so it has two energy levels, or shells.

• Draw the shells around the nucleus.

C

### Bohr Diagrams

• Carbon has 6 electrons.

• The first shell can only hold 2 electrons.

C

### Bohr Diagrams

• Since you have 2 electrons already drawn, you need to add 4 more.

• These go in the 2nd shell.

• Add one at a time -starting on the right side and going counter clock-wise.

C

### Bohr Diagrams

• You should have 6 total electrons for Carbon.

• Only two electrons can fit in the 1st shell.

• The 2nd shell can hold up to 8 electrons.

• The 3rd shell can hold 18, but the elements in the first few periods only use 8 electrons.

C

### Bohr Diagrams

Try the following elements on your own:

• H

• He

• O

• Al

• Ne

• K

C

### Bohr Diagrams

Try the following elements on your own:

• H – 1 electron

• He

• O

• Al

• Ne

• K

H

### Bohr Diagrams

Try the following elements on your own:

• H

• He - 2 electrons

• O

• Al

• Ne

• K

He

### Bohr Diagrams

Try the following elements on your own:

• H

• He

• O - 8 electrons

• Al

• Ne

• K

O

### Bohr Diagrams

Try the following elements on your own:

• H

• He

• O

• Al - 13 electrons

• Ne

• K

Al

### Bohr Diagrams

Try the following elements on your own:

• H

• He

• O

• Al

• Ne - 10 electrons

• K

Ne

### Bohr Diagrams

Try the following elements on your own:

• H

• He

• O

• Al

• Ne

• K - 19 electrons

K

### Bohr Diagrams

End of Study Guide.

You should know how to draw a Bohr Diagram for the first 20 elements.