Revisuon

Question 1

why are are atoms neutral

Answer 1

equal number of protons and electrons and opposite charge so balances out

Question 2

mass number def

Answer 2

number of protons and neutrons

Question 3

why do isotopes of an element have the same chemical properties

Answer 3

same number of electrons in the outer shell

Question 4

how is periodic table organised

Answer 4

number of electrons increases as you go down the group
metal and non metal

Question 5

what type of bonding in sodium chloride

Answer 5

ionic

Question 6

what is an ion

Answer 6

atom with charge +-

Question 7

what is an ionic bond

Answer 7

transfer of e- between metal and non metal

Question 8

what happens when metals react

Answer 8

lose electrons
form ion

Question 9

the more reactive a metal is

Answer 9

more vigorous reaction
more easily loses electron

Question 10

cation

Answer 10

positive ion

Question 11

metal + water

Answer 11

metal hydroxide + hydrogen

Question 12

reversible reaction of water and its ions

Answer 12

H20->H+ + OH-

Question 13

what does aqueous mean

Answer 13

dissolved in pure water

Question 14

metal+ oxygen

Answer 14

metal oxide