Page 45 - Curriculum Visions Dynamic Book
P. 45
Chromium
Essential trace element in food
Resistant to corrosion
Compounds are brightly coloured
Alloyed with other metals to improve their strength and corrosion resistance
A soft, silver–white metal, chemical symbol Cr
Rare metal that does not occur uncombined in nature
Many of the compounds are toxic
Highly reflective
Has no smell Has no taste
Manganese
Atomic number 24, atomic weight about 52
Essential for plant growth
Forms the red– brown colouring of some gemstones
Is alloyed with iron to improve hardness
Slightly magnetic
Found most commonly as manganese nodules on the ocean floor
Has no smell Has no taste
A soft, silver–grey metal, chemical symbol Mn
Atomic number 25, atomic weight about 55
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