C8 - periodic table (Mendeleev, G1, G7, G0, transition metals)
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which group is missing from Mendeleev’s table & why
-group 0 -they were harder to discover as they are unreactive
why did Mendeleev leave gaps in his table
for missing elements that were not discovered yet
2 ways Mendeleev’s table is more useful than Lavoisier’s table
-left gaps for missing elements that weren’t discovered yet -can use to work out electronic structure
Explain how the modern periodic table was arranged in terms of their atomic structure
arranged in: -groups - no. electrons in valance shell -periods - no. occupied shells -elements in order of proton number
trend in metallic character across a period
metal to non- metal
name for group 1
alkaline metals
electronic structure of G1
1 e- in out shell
Trends in G1 as you go down (electrical conductivity - yes)
reactivity- up density- up melting point- down
Why do G1 get more reactive as you go down
the outer electron is further from the nucleus so the shielding effect is greater, meaning it is easier to lose an electron
properties of G1
-good conductors of electricity -good conductors of heat -soft metals
Where are G1 stored and why
-in oil so they do not oxidize or react with water -highly reactive
How do you know G1 is basic
it turns purple under universal indicator after reacting with water.
What coloured compound do G1 form when bonded with non- metals
white coloured
name for group 2
alkaline earth metals
name for group 7
halogens
electronic structure in G7
7 e- in out shell
what are G7 molecules
diatomic
what is a compound with halogen called
halide
Trends in G7 as you go down (electrical conductivity - no)
reactivity- down density- up melting point- up colour - darker
Why do G7 get more reactive as you go up
the outer shell of electrons is closer to the nucleus so the shielding effect is less, meaning it is easier to gain an electron
colour and state of chlorine, bromine, iodine at room temperature
chlorine- pale yellow- green gas bromine- red- brown liquid iodine- grey- black solid
what is the colour of iodine and bromine when aqueous
bromine- orange iodine- brown
name for group 0
noble gases
describe G0
unreactive monoatomic gases