Flashcards in Section 14- Groups in the periodic table Deck (42):
What are elements called which are in group 1?
What are elements called which are in group 7?
What are elements called which are in group 0?
What do all alkali metals have in common?
They all have 1 electron in their outer shell
What are the electron configurations of the first three alkali metals?
2.1, 2.8.1, 188.8.131.52
What are the properties of alkali metals?
Soft, low melting points, float
What is the reaction of lithium and water like?
Gives off a red flame
What is the reaction of sodium and water like?
Yellow flame given off
What is the reaction of potassium and water like?
gives of a lilac flame
Potassium + Water =
Why do the alkali metals get more reactive as you go down the group?
As it is easier to lose electrons from its outer shell as its further from the nucleus
What is the colour and physical state of chlorine at room temperature?
What is the colour and physical state of bromine at room temperature?
What is the colour and physical state of iodine at room temperature?
What are the electron configurations of the first 3 halogens?
2.7, 2.8.7, 184.108.40.206
What do the halogens all have in common?
They have 7 electrons on their outer shell
State the trend in reactivity of the halogens as you go down group 7
- They get less reactive
- The outer shell is going further away from the nucleus so harder to attract electrons
- More shells/bigger
- Melting point increases
What is the chemical test for chlorine?
Damp blue litmus paper turns red then white
What happens when you react the halogens with metals?
They form metal halides e.g., chlorine + hydrogen = hydrogen chloride
When the halogens form hydrogen halides what happens when they then dissolve in water?
They form acidic solutions. e.g. hydrogen chloride + water = hydrochloric acid
What happened when lithium or potassium is mixed with water?
Floats, fizzed, hydrogen given off
What is the number in the bottom of an element representing?
The number of electrons and protons separately
What is the number above an element representing?
The number of protons and neutrons added together
The more the electrons....
the further the outer shell is from the nucleus. This means it is more reactive as the decrease in attraction between the nucleus and outer shell makes it easier to get rid of the outer shell electrons.
How many electrons do halogens have on their outer shell?
7. This means they will want to gain 1 electron to form a full outer shell.
What halogens go round in?
Why are displacement reactions are redox reactions in terms of gain and loss of
Displacement reactions are examples of redox reactions: the ions of the less reactive metal gain electrons and are reduced. the atoms of the more reactive metal lose electrons and are oxidised.
What would you see when you react chlorine and sodium iodide solutions?
It would turn orange/red. Chlorine can't displace iodide
Write the ionic equation for potassium and water
2K(g) + H20(L) = K20(aq) + 2H(g)
What is oxidised in the experiment of potassium and water?
Potassium as it is more reactive
What colour would chlorine water turn universal indicator to?
What colour would bromine water turn universal indicator to?
What colour would iodine water turn universal indicator to?
Which is the most reactive halogen?
Why don't noble gases react?
Because they have a full outer shell
What are the properties of the noble gases?
Inert(unreactive) and have a full outer shell
What property of helium is good for balloons?
What property of argon makes it good for filament light bulbs?
Doesn't react with oxygen so won't burn
Write the electron configurations of the first three noble gases
2.0, 2.8, 2.8.8, they all have a full outer shell.
What are the first three noble gases?
Helium, neon, argon
What are the first three alkali metals?
Lithium, sodium, potassium