Complete the following notes on the text
MAGNESIUM
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Sources
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For human body
| In industry
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Mg in soil
| plants
| man
| (1)
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| Vast deposits of ores (e.g. (2))
0.12% Mg in seawater … trillions of tons in oceans (leached from (3) by rivers
|
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Properties
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An essential (4) for all living things
At heart of chlorophyll mol. needed (5) to trap sun's energy and make sugar & starch mols
Daily (6) ⅓ - ½ g
Most Mg stored in bones – 25 g throughout (7)
3 …: (8)
(i) regulates movements through membranes
(ii) part of enzymes that release energy from food
(iii) (9)
Deficiency rare but signs are lethargy, irritation, depression
| The most abundant metal on earth
(i) does not burn in bulk
(ii) tubes and rods
(10)
(iii) (11)
(iv) can be cheaply recycled
Prodn. > 300,000 t (about ½ from sea)
> (12) per a. by end of C
Expanding mkt
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Uses
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Medical
| Industrial
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Has been successful in treatment of chronic fatigue syndrome, according to recent research
| in steel refining to remove (13) & strengthen aluminium
Cycle, luggage, car seat (14), disc drives, camera & vehicle parts
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