C2 The Periodic Table

Question 1

Alkali metals

Answer 1

Elements in group 1 of the periodic table

Question 2

Halogens

Answer 2

Elements in group 7 of the periodic table

Question 3

Noble gases

Answer 3

Elements in group 0 of the periodic table

Question 4

Displacement reactions

Answer 4

A reaction where a more reactive element takes the place of a less reactive element in a compound

Question 5

Transition elements

Answer 5

Elements from the central block of the periodic table

Question 6

The development of the periodic table

Answer 6

• elements for first classified in order of their atomic weights

Question 7

The development of the periodic table

Answer 7

• the early periodic tables were incomplete

Question 8

The development of the periodic table

Answer 8

• Mendeleev changed this way by leaving gaps for elements that he thought had not been discovered and change the order based on chemical properties

Question 9

The development of the periodic table

Answer 9

• elements with properties predicted by Mendeleev were discovered and filled the gaps

Question 10

Group 1 - The alkali metals

Answer 10

Alkali metals have characteristic properties because of the single electron in their outer shell

Question 11

Group 1 - The alkali metals

Answer 11

Alkali metal + water > alkali metal hydroxide + hydrogen

Question 12

Group 1 - The alkali metals

Answer 12

Alkali metal + chlorine > alkali metal chloride

Question 13

Group 1 - The alkali metals

Answer 13

Alkali metal + oxygen > Alkali metal oxide

Question 14

Group 1 - The alkali metals

Answer 14

The reactivity increases going down the group

Question 15

Group 7 - the halogens

Answer 15

• the halogens have similar reactions because they all have 7 electrons in their outer shell

Question 16

Group 7 - the halogens

Answer 16

• the halogens are non metals and consist of molecules made of pairs of atoms (diatomic molecules )

Question 17

Group 7 - the halogens

Answer 17

• the further down the group an element is the higher it’s relative molecular mass, melting point and boiling point

Question 18

Group 7 - the halogens

Answer 18

• the reactivity decreases going down the group

Question 19

Group 7 - the halogens

Answer 19

• a more reactive halogen can displace a less reactive halogen from an aqueous solution of its salt

Question 20

The transition elements

Answer 20

The transition elements are metals with similar properties which are different from those of the elements in group 1. They are:

Question 21

The transition elements

Answer 21

• much less reactive than group 1 elements
• good conductors of electricity
• hard and strong
• high density
• high melting points (with the exception of mercury)

Question 22

The transition elements

Answer 22

Many transition elements have ions with different charges, form coloured compounds and are useful as catalysts