alkali metals and halogens

Question 1

what is the pattern of reactivity for alkali metals

Answer 1

further down the table the more reactive

Question 2

characteristics of alkali metals

Answer 2

1) low density (float)
2) soft
3) shiney
4) 1 electron in outer shell

Question 3

how do alkali metals become an ion

Answer 3

lose an electron

Question 4

why do the metals become more reactive down the group

Answer 4

outer shell is further away from the nucleus so there is less attraction to nucleus which makes it easily lost

Question 5

equation for alkali metals and oxygen

Answer 5

4Na + O2 > 2NaO

Question 6

alkali metals reaction with chlorine

Answer 6

2Li + Cl2 > 2LiCl2

Question 7

alkali metals reaction with water

Answer 7

2K +2H2O > 2KOH +H2

Question 8

characteristics of halogens

Answer 8

1) 7 electrons in outer shell

2) always come in pairs (O2)

Question 9

what is the pattern of reactivity for halogens

Answer 9

more reactive up the group

Question 10

why does reactivity increase up the group for halogens

Answer 10

1) distance of outer shell electrons to positively charged nucleus decreases
2) attraction between nucleus and outer shell electrons is greater
3) electron more readily gained

Question 11

what happens in halogen displacement

Answer 11

the more reactive halogen replaces the other in the equation