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Gold (Au) by Mind Map: Gold (Au)

1. introduction

1.1. Atomic number 79

1.1.1. number of protons = number of electrons = 79

1.2. Symbol Au comes from Latin: Aurum

2. physical properties

2.1. In its purest form

2.1.1. ductile

2.1.2. malleable

2.1.3. reddish- yellow colour

2.1.4. dense

2.1.5. soft

2.2. Phase (at STP) solid

2.3. Melting point 1337.33 K ​(1064.18 °C, ​1947.52 °F)

2.4. Boiling point 3243 K ​(2970 °C, ​5378 °F)

2.5. Density (near r.t.) 19.30 g/cm3

3. atomic model of gold

3.1. electronic configuration

3.1.1. 2, 8, 18, 32, 18, 1

4. uses

4.1. used for making jewellery

4.2. making coins of very high value

4.3. used in dentistry for filling cavities in teeth

5. history & discovery

5.1. discovery

5.1.1. in the middle east in 6000bce

5.2. history

5.2.1. historically gold coinage was widely used as currency

5.2.2. when paper money was introduced

5.2.2.1. A reciept redeemable for a gold coin or bullion

6. unique chemical characteristic

6.1. gold- transition metal

6.2. transition metals are unique

6.3. this is because they can bod with other elements

6.4. and also can bond with outer most 2 shells

7. alloy

7.1. tumbaga

7.1.1. tumbaga is the name for a non-specific alloy of gold and copper given by Spanish Conquistadors

7.1.2. uses

7.1.2.1. Tumbaga was widely used by the pre-Columban cultures of Central America to make religious objects.