C4 - Chemical Patterns

Question 1

The significant stages in the history of the development of the periodic table included the ideas of which 3 scientists?

Answer 1

• Dobereiner
• Newlands
• Mendeleev

Question 2

What did Mendeleev use the periodic table to do?

Answer 2

Predict the existence of unknown elements

Question 3

What are group 1 metals called?

Answer 3

The alkalis

Question 4

What is the chemical symbol for the following group 1 elements?

• Lithium
• Sodium
• Potassium

Answer 4

• Lithium = Li
• Sodium = Na
• Potassium = K

Question 5

a) What are alkali metals like when freshly cut?

b) How, when and why does this change?

Answer 5

a) Shiny

b) Tarnishes rapidly in moist air due to reaction with oxygen

Question 6

Talk about the melting and boiling points of Group 1 elements.

Answer 6

The further you go down the group, the lower the melting and boiling points of the elements.

Question 7

Talk about the density of Group 1 elements.

Answer 7

The further you go down the group, the higher the density of the elements.

Question 8

Talk about the reactivity of Group 1 elements.

Answer 8

The further you go down the group, the higher the reactivity. This is because the outer shell gets further away from the influence of the nucleus and so the electron is lost more easily (remember - group 1 elements only have 1 electron on their outer shell)