Group 1 + 7

Question 1

What are Group 1 elements also know as

Answer 1

Alkali Metals

Question 2

Describe the reaction of potassium and water?

Answer 2

• moves even faster
• small explosion
• melts into a ball bearing
• lilac flame

Question 3

What is the symbol equation for sodium and water

Answer 3

2Na + 2H20 —> 2NaOH + H2

Question 4

Do group 1 element get more reactive when you go down or up the group

Answer 4

Down

Question 5

Why do Group 1 metals get more reactive as you go down the group?

Answer 5

• all Group 1 metals have 1 electron in their outermost shell
• as you go down the group there are more electrons, meaning the outermost electron is further from nucleus
• nuclear attraction to outermost electron is weaker because more shielding
• outermost electron lost more easily, so more reactive

Question 6

What are group 7 elements also know as?

Answer 6

The Halogens

Question 7

What colour and state is Fluorine, Chlorine, Bromine, Iodine

Answer 7

Fluorine - Pale yellow, gas
Chlorine - Pale green, gas
Bromine - Red/Brown liquid , orange vapour
Iodine- Dark Grey Solid, Sublimes into Purple Vapour

Question 8

The halogens at what D________ molecules

Answer 8

Diatomic
2 Atoms- Sharing electrons to form Covalent Bond

Question 9

Explain why the Halogens reactivity decrease down the group?

Answer 9

• all Group 7 elements wants to gain 1 electron
• down the group more electron shells
• outermost electron shell LESS STRONGLY attracted to NUCLEUS
• harder to attract 1 extra electron into outer shell (atomic radius is larger)

Question 10

List some properties of the Alkali Metals

Answer 10

• soft
• dull when exposed to oxygen
• low density
• low melting point

Question 11

What type of compound is formed when a Alkali metals reacts with a non-metal.

Answer 11

Ionic Compound