Reactivity w/ Valence Electons

Element Reactivity

Multiple Choice

What is the overall charge of an atom?

• positive

• neutral

• negative

Noble Gases

The noble gases do not react with other elements because they already have a full valence shell!

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

Math Response

How many valence electrons does Calcium have?

Type answer here

Correct Answer: 2

Deg^°

Rad

Draw

Draw a Lewis Dot Diagram for Helium.

Draw

Draw a Lewis Dot Diagram for Sulfur.

Match

Match the following

• Group 1

• Group 17

• Group 18

• Groups 3-12

Alkali Metals

Halogens

Noble Gases

Transition Metals

• Alkali Metals

• Halogens

• Noble Gases

• Transition Metals

Atoms want a full valence shell!

​

​The closer an element is to having a full valence shell, the more reactive the element is.

Gain or Lose

​

Atoms gain gain or lose valence electrons to get a full valence shell.

​Metals Non-metals

Metals Rule 1

​

Metals tend to LOSE electrons to get a full valence shell.

The alkali metals are very reactive because they are just one electron away from a full valence shell.

The alkaline earth metals are reactive but not as much as alkali metals. They have to lose two electrons to be happy.

Multiple Choice

How many valence electrons are Group 1 elements away from having a full valence shell?

• 1

• 2

• 3

• 4

Multiple Choice

How many valence electrons are Group 2 elements away from having a full valence shell?

• 1

• 2

• 3

• 4

Multiple Choice

Which group in the periodic table contains the most reactive metals?

• Alkali Metals

• Transition Metals

• Halogens

• Alkaline Earth Metals

More Shells = More Reactive

​

For metals, valence electrons are easier to lose the further they are from the nucleus.

Metals Rule 2

​

Reactivity goes up with the number of electron shells
for metals.

Reorder

Order the following from MOST to LEAST reactive.

• Cesium

• Rubidium

• Potassium

• Sodium

• Lithium

1

2

3

4

5

• 1
• 2
• 3
• 4
• 5

Comparing Groups 1 and 2

Always consider valence electrons first THEN number of shells.

Multiple Choice

Atoms want ___________ to be happy.

• a larger nucleus
• more neutrons
• a positive charge
• a full valence shell

Multiple Choice

The closer an element is to having a full shell the ________ reactive it is.

• more

• less

• same

Multiple Choice

When metal atoms have more and more electron shells their reactivity...

• decreases

• increases

• stays the same

Multiple Choice

The most reactive metals on the periodic table are the...

• transition metals

• alkaline earth metals

• alkali metals

• noble gases

Non metals want a full valence shell too!

Remember, atoms gain gain or lose valence electrons to get a full valence shell.

Non-Metal Rule 1

Non-metals tend to GAIN electrons to get a full valence shell.

It's easier to gain 1 or 2 than to lose 6 or 7.

The halogens are very reactive because they are just one electron away from a full valence shell.

Multiple Choice

How many valence electrons are Group 16 elements away from having a full valence shell?

• 1

• 2

• 3

• 4

Multiple Choice

How many valence electrons are Group 17 elements away from having a full valence shell?

• 1

• 2

• 3

• 4

Multiple Choice

How many valence electrons are Group 15 elements away from having a full valence shell?

• 1

• 2

• 3

• 4

Multiple Choice

Which group in the periodic table contains the most reactive non-metals?

• Alkali Metals

• Transition Metals

• Halogens

• Noble Gases

Less Shells = More Reactive

​

For non-metals, valence electrons are easier to gain the closer they are to the nucleus.

Non-Metals Rule 2

​

Less shells = more reactive

Reorder

Order the following from MOST to LEAST reactive. (How many valence electrons away from being happy?)

• Lithium

• Beryillium

• Boron

• Carbon

1

2

3

4

• 1
• 2
• 3
• 4

Both 1 valence electron away?
It is easier for elements to lose one electron
than gain one electron.

​

Reorder

Order the following from MOST to LEAST reactive.

• Lithium

• Fluorine

• Beryillium

• Oxygen

• Nitrogen

1

2

3

4

5

• 1
• 2
• 3
• 4
• 5

Reorder

Order the following from MOST to LEAST reactive.

• Fluorine

• Chlorine

• Bromine

• Iodine

• Astatine

1

2

3

4

5

• 1
• 2
• 3
• 4
• 5

Dropdown

​

Select answer

tend to lose valence electrons and​

Select answer

tend to gain valence electrons.

Multiple Choice

Do you think Calcium will gain or lose valence electrons?

• Gain

• Lose

Multiple Choice

Do you think Sodium will gain or lose valence electrons?

• Gain

• Lose

Multiple Choice

Do you think Fluorine will gain or lose valence electrons?

• Gain

• Lose

Multiple Choice

Do you think Sulfur will gain or lose valence electrons?

• Gain

• Lose

Reactivity increases

Noble Gases

​

Noble gases don't react!
They already have a
full valence shell.