C.2 The Periodic Table CQ Flashcards
(21 cards)
In the modern periodic table, how are atoms arranged?
By their atomic number and in groups according to chemical properties.
Why did Mendeleev leave gaps in the periodic table?
For elements that had not been discorvered
Why do elements of the same group have similar properties?
They have the same number of electrons in their outer shell
Before the discovery of subatomic elements, how did scientist organise the elements?
By atomic wieght
Which discovery meant that organising by weight was not always correct?
Isotopes
What is the name given to elements in group 0
Nobel Gases
Why are noble gases inert?
As they have a full outer shells so do not need to gain or lose electrons
How does boiling point change in Group 0
Increases down the group
(increased Ar and stronger intermolecular forces)
Why are Group 1 called Alkali metals?
They are metals that form alkalis when reacting with metal.
What are the product of alkali metals with: oxygen, water, halogens?
Water - Metal Hydroxide + Hydrogen
Oxygen - Metal Oxide
Halogen - Metal Halide
Why are Group 1 more reactive as you go down the group?
- More electrons
- Further distance from the nucleus to the outer electron
- Weaker electrostatic force between nucleus and outer electron
- Easier to LOOSE electrons
What name do Group 7 get?
Halogens
How does the boiling point of Group 7 change?
Increases down the group
How does the reactivity change in Group 7?
- Less reactive down the group
- More electrons
nucleus to the outer electron - Weaker electrostatic force between nucleus and outer electron
- Harder to GAIN electron
What is a displacement reaction?
When a more reactive element displaces a less reactive element
Reactivity Series
Please Stop Lovingly Calling Me A Cute Zebra Instead Try Learning How Cows Scran Grass Period
Potassium
Sodium
Lithium
Calcium
Magnesium
Aluminium
Carbon
Zinc
Iron
Tin
Lead
Hydrogen
Copper
Silver
Gold
Platinum
Where are transition metals found?
In the middle
Compare melting points, density, strength, hardness and reactvity of transition metals to Group 1
Transition metals are MORE/HIGHER
Dense, Strong, Hard, Melting Point
LESS
Reactive
What is distinct about ions formed by transition metals?
Can have ions with different charges
What is distinct about compounds formed form transition metals
They are coloured
What can transition metals be used for?
Catalysts
