Section 3: Representative Groups

Question 0

Why do properties vary across the table

Answer 0

Number of valence electrons increases from left to right

Question 1

Valence electron

Answer 1

Electron in the highest occupied energy level of an atom

Question 2

Why do elements in a group have similar properties

Answer 2

Same number valence electrons

Question 3

Alkali metals

Answer 3

Group 1A.

Extremely reactive.

Question 4

How is reactivity shown in groups

Answer 4

Reactivity increases from top to bottom (1A)

Question 5

Alkaline Earth Metals

Answer 5

Group 2A
Harder
Higher melting points

Question 6

How are differences in reactivity shown among Alkaline Earth Metals

Answer 6

The way they react with water

Question 7

Magnesium

Answer 7

Photosynthesis
Bicycle frames
AEM

Question 8

Calcium

Answer 8

Bones and teeth

AEM

Question 9

Boron Family

Answer 9

Group 3A

Question 10

The most abundant metal in Earth’s crust.

Answer 10

Aluminum

In Boron Family

Question 11

Carbon Family

Answer 11

4A

Metallic nature of elements increases from top to bottom within group.

Question 12

Nitrogen Family

Answer 12

5A

Includes elements with wide range of physical properties

Question 13

Oxygen Family

Answer 13

6A

Question 14

The most abundant element in Earth’s crust

Answer 14

Oxygen

Question 15

Halogens

Answer 15

7A
Many physical differences, similar chemical properties
Highly reactive nonmetals

Question 16

Noble Gases

Answer 16

8A 
Also Helium bc why not
Colorless, odorless, extremely unreactive 
Hard to discover 
Useful, can be used in neon lights