occurence of metals ?
Answers
Answer:
Mostly the metals occur in nature in a combined states but sometimes they can also occur in a free state.A native metal is a metal found in its metallic state naturally, either in pure form or in the form of an alloy .Most metals can't resist natural processes like oxidation ,corrosion etc.
Answer:
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Explanation:
KEY POINTS:
(1)Very few metals can resist natural weathering processes like oxidation, which is why generally only the less reactive metals,such as gold and Platinum,are found as native metals.
(2)Native metals were prehistoric man's only access to metal, because smelting is thought to have been discovered around 6500 BC.
(3)combining different ratios of metals as alloys modifies the properties of pure metals to produce desirable characteristics.
(4)The aim of making alloys is generally to make them less brittle,harder, resistent to corrosion,or have a more desirable color and luster.
(5)Metals are often extracted from the Earth by means of mining, resulting in ores that are relatively rich sources of the requisite elements.
TERMS:
(1)mining the activity of removing solid valuable from the earth.
(2)alloy a metal that is a combination of two or more elements ,at least one of which is a metal.