Pre-AP Electrons

Electrons

Multiple Choice

Isotopes are atoms of a same element with a different number of...

• neutrons
• protons
• electrons

Labelling

Match the correct parts of an atom.

Drag labels to their correct position on the image

Proton

Neutron

Electron

Electron Levels (Shells)

Nucleus

• Electrons further away from the nucleus have more energy and electrons closer to the nucleus have less energy.

• The energy of an electron must match one of the energy levels in the atom.

• Each energy level can hold only a certain number of electrons, and no more.

• As electrons are added to an atom, they settle into the lowest unfilled energy level.

Multiple Choice

Electrons have ____ energy when they are farther away from the nucleus.

• More

• Less

In the Bohr model of the atom, the first energy level can accept up to 2 electrons. The second and third energy levels hold up to 8 electrons each. The fourth and fifth energy levels hold up to 18 electrons each.

Energy Levels

Match

Match the following

• 2 electrons

• 8 electrons

• 8 electrons

• 18 electrons

First energy level

Second Energy Level

Third Energy Level

Fourth Energy Level

• First energy level

• Second Energy Level

• Third Energy Level

• Fourth Energy Level

Draw

Draw where the electrons for Carbon would be. (Carbon has an atomic number of 6)

Draw

Draw where the electrons for Aluminum would be. (Aluminum has an atomic number of 13)

The electrons in the highest, unfilled energy level are called VALENCE ELECTRONS.

​
These electrons interact with different atoms.

Valence Electrons

Multiple Choice

The electrons in the highest, unfilled energy level of an atom are called...

• core electrons
• valence electrons
• inner electrons
• subvalence electrons

Multiple Choice

How many electron levels (shells) do all the elements in the fourth period have?

• 2
• 3
• 4
• 1

Multiple Choice

How many valence electrons do all the elements in Group 2 have?

• 6

• 1
• 8

• 2

Multiple Choice

How many valence electrons do all the elements in Group 16 have?

• 6

• 1
• 8

• 2

Multiple Choice

Which element has 2 electron levels (shells) and 3 valence electrons?

• Magnesium

• Boron

• Calcium

• Aluminum

Multiple Choice

Which element has 5 electron levels (shells) and 4 valence electrons?

• Vanadium

• Tin

• Antimony

• Lead

Multiple Choice

Which element has 6 electron levels (shells) and 2 valence electrons?

• Molybdenum

• Barium

• Oxygen

• Sulfur

Math Response

How many valence electrons does Carbon have?

Type answer here

Correct Answer: 4

Deg^°

Rad

Math Response

How many valence electrons does Calcium have?

Type answer here

Correct Answer: 2

Deg^°

Rad

Why are these important?

The valence electrons are the electrons that are responsible for chemical bonding.

​Most of the matter you use every day is in the form of compounds and mixtures, not elements.

This is why we don't see pure elements naturally occur.

Chemical Bonds

Brain Break

-A way to represent an atom’s valence electrons
-Shows the element symbol surrounded by one to eight dots

-​Each dot represents one electron

Lewis Dot Diagram

How to Draw
Lewis Dot Diagrams

​H

​Li

​B

​O

​Note: Each side will get one electron before any side gets two electrons.

Draw

Draw a Lewis Dot Diagram for Carbon.

Draw

Draw a Lewis Dot Diagram for Silicon.

Draw

Draw a Lewis Dot Diagram for Argon (18).

Draw

Draw a Lewis Dot Diagram for Helium.

Review

Multiple Choice

Which of these diagrams shows 3 valence electrons?

• A

• B

• C

• D

Match

Which Groups do each atom belong to?

• A

• B

• C

• D

Group 1

Group 13

Group 2

Group 15

• Group 1

• Group 13

• Group 2

• Group 15

Multiple Select

Name three elements that have this Lewis Dot Diagram.

• Bismuth

• Phosphorus
• Sulfur

• Carbon
• Nitrogen

Multiple Choice

How many valence electrons do all the elements in Group 16 have?

• 6

• 1
• 8

• 2

Multiple Choice

Using the periodic table, predict which element has a full valence shell (energy level).

• Neon

• Lithium

• Carbon

• Oxygen