C8 - periodic table (Mendeleev, G1, G7, G0, transition metals)

Question 1

which group is missing from Mendeleev’s table & why

Answer 1

-group 0
-they were harder to discover as they are unreactive

Question 2

why did Mendeleev leave gaps in his table

Answer 2

for missing elements that were not discovered yet

Question 3

2 ways Mendeleev’s table is more useful than Lavoisier’s table

Answer 3

-left gaps for missing elements that weren’t discovered yet
-can use to work out electronic structure

Question 4

Explain how the modern periodic table was arranged in terms of their atomic structure

Answer 4

arranged in:
-groups - no. electrons in valance shell
-periods - no. occupied shells
-elements in order of proton number

Question 5

trend in metallic character across a period

Answer 5

metal to non- metal

Question 6

name for group 1

Answer 6

alkaline metals

Question 7

electronic structure of G1

Answer 7

1 e- in out shell

Question 8

Trends in G1 as you go down
(electrical conductivity - yes)

Answer 8

reactivity- up
density- up
melting point- down

Question 9

Why do G1 get more reactive as you go down

Answer 9

the outer electron is further from the nucleus so the shielding effect is greater, meaning it is easier to lose an electron

Question 10

properties of G1

Answer 10

-good conductors of electricity
-good conductors of heat
-soft metals

Question 11

Where are G1 stored and why

Answer 11

-in oil so they do not oxidize or react with water
-highly reactive

Question 12

How do you know G1 is basic

Answer 12

it turns purple under universal indicator after reacting with water.

Question 13

What coloured compound do G1 form when bonded with non- metals

Answer 13

white coloured

Question 14

name for group 2

Answer 14

alkaline earth metals

Question 15

name for group 7

Answer 15

halogens

Question 16

electronic structure in G7

Answer 16

7 e- in out shell

Question 17

what are G7 molecules

Answer 17

diatomic

Question 18

what is a compound with halogen called

Answer 18

halide

Question 19

Trends in G7 as you go down
(electrical conductivity - no)

Answer 19

reactivity- down
density- up
melting point- up
colour - darker

Question 20

Why do G7 get more reactive as you go up

Answer 20

the outer shell of electrons is closer to the nucleus so the shielding effect is less, meaning it is easier to gain an electron

Question 21

colour and state of chlorine, bromine, iodine at room temperature

Answer 21

chlorine- pale yellow- green gas
bromine- red- brown liquid
iodine- grey- black solid

Question 22

what is the colour of iodine and bromine when aqueous

Answer 22

bromine- orange
iodine- brown

Question 23

name for group 0

Answer 23

noble gases

Question 24

describe G0

Answer 24

unreactive monoatomic gases

Question 25

electronic structure of G0

Answer 25

full outer shell of e-

Question 26

what are G0 atoms

Answer 26

monoatomic

Question 27

Trends in G0 as you go down
(electrical conductivity - no)

Answer 27

reactivity- unreactive
density- up
melting point- nul

Question 28

2 uses of noble gases

Answer 28

argon in lamps, helium in balloons

Question 29

5 properties of transition metals

Answer 29

-high melting point except mercury
-high density
-good conductors of heat and electricity
-form coloured compounds
-low volatility
-forms differently charged ions

Question 30

what are transition metals used as

Answer 30

catalyst to speed up chemical reactions

Question 31

How do you test for hydrogen

Answer 31

Put a lit splinter next to the gas and you will hear a squeaky pop

Question 32

displacement reactions

Answer 32

the more reactive element will displace the less reactive element from the compound