Properties of elements

Question 1

Group 1 properties

Answer 1

Soft and cut with a knife
Reacts rapidly with oxygen
Reacts rapidly with chlorine
Reacts rapidly with water

Question 2

Group 1 reaction with water

Answer 2

Turns water into hydroxide, making it alkali
Forms hydrogen therefore there’s fizzing
Floats

Question 3

Why does group 1 become more reactive going down?

Answer 3

To react, it loses an electron
Going down = more shells
More shells = more shielding between reacting outer electron and nucleuses
More shielding = easier to react

Question 4

Group 7 properties

Answer 4

Forms molecules of 2 of the same to form covalent bond eg Cl2
Increased boiling and melting point going down
Forms covalent compounds with non metal atoms
Can displace a less reactive halogen from its salt compound

Question 5

Why does group 7 become less reactive going down?

Answer 5

To react it gains electron
Going down = more shielding between the nucleus and reacting electron from other molecule
More shielding = less attraction = less reactive