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Group II Elements - Coggle Diagram
Group II Elements
Properties
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generally form white, ionic compounds
(except beryllium)
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Atomic
Radius
DECREASES down Group II
- more filled energy levels (shells) between
nucleus + outer most electron
- outer electron more shielded + further
from nucleus
- INCREASE in ATOMIC RADIUS
Ionisation Energies
1st ionisation energy DECREASES down group
- distance between N + OE increases
- increase in shielding - more filled energy levels between N + OE
- easier to remove outer electron as
LESS ATTRACTION
Reaction with Oxygen
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- Mg = intense white flame
- Ca = brick red flame
- St = red flame
- Ba = green flame
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Uses
Magnesium
- fireworks
- extraction of titanium
- alloys = light+strong
(aircraft)
Magnesium Hydroxide
- indigestion remedies
(neutralise excess acid
in stomach)
- treat constipation
Calcium Carbonate
- naturally limestone
- construction + road building
- production iron
- remove acid impurities (SiO2)
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2.CaO + H2O --> Ca(OH)2 (slacked lime)
obs = expand, crumble, hiss
slacked lime - neutralise acidic soils
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- CaCO3 reacts with excess CO2 -
milky to colourless
Barium Sulfate
- 'barium meal' prep for
X-ray - gut located
- insoluble so not absorbed
into blood so harmless