Structure 3.1

Question 1

What are groups

Answer 1

Vertical column

Question 2

What are periods

Answer 2

Horizontal row

Question 3

Group 1 name

Answer 3

Alkali metals

Question 4

Group 2 name

Answer 4

Alkali earth metals

Question 5

Group 7/17 name

Answer 5

Halogen

Question 6

Group 8/18 name

Answer 6

Noble gases

Question 7

What is electron shielding?

Answer 7

Electron shielding occurs when inner shielding electrons shield the outer valence electrons the full attraction of the nucleus.

Question 8

State the variance in electron shielding according to the periodic table

Answer 8

• Constant across period
• Increasing down a group

Question 9

What is effective nuclear charge?

Answer 9

Question 10

State the variance in effective nuclear charge according to the periodic table

Answer 10

• Increases across period
• Constant down group

Question 11

Comment on the trend in atomic radii across a period

Answer 11

Decreases due to higher positive charge and same amount of shielding.

Question 12

Comment on the trend in atomic radii down a group

Answer 12

Increases due to more energy levels.

Question 13

Comment on the general rule for ionic radii

Answer 13

Ionic radius is smaller for positive ions and larger for negative ions