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History of the discovery of metals

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CT
Chris Terry

Just an initial demo map, so that you don't start with an empty map list ...

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History of the discovery of metals 저자: Mind Map: History of the discovery of metals

1. History

1.1. First metal discovered: Gold

1.2. Metal discovered in 6000BC

1.3. Metals with low reactivity are discovered first

1.4. 86 metals discovered so far

2. Extraction of Metals

2.1. Electrolysis

2.2. Heating ore with carbon

2.3. Heating

2.4. Excavation

3. Factors affecting rarity of metals

3.1. Reactivity

3.2. Boiling point & Melting point

3.3. Appearance and detectability

4. Previous uses of metals

4.1. Form of monetary currency

4.2. Component for weapons

4.3. Measure of wealth and infulence