Currently There are 86 Known Metals.
Before the 19th century only 24 of these metals had been discovered and, of these 24 metals, 12 were discovered in the 18th century. Therefore, from the discovery of the first metals - gold and copper until the end of the 17th century, some 7700 years, only 12 metals were known.
Four of these metals, arsenic, antimony , zinc and bismuth , were discovered in the thirteenth and fourteenth centuries, while platinum was discovered in the 16th century.
The other seven metals, known as the Metals of Antiquity, were the metals upon which civilization was based.
These Seven Metals Were:
1) Gold (ca) 6000BC
2) Copper (ca) 4200BC
3) Silver (ca) 4000BC
4) Lead (ca) 3500BC
5) Tin (ca) 1750BC
6) Iron, smelted (ca) 1500BC
7) Mercury (ca) 750BC
Before 1800 There Were 12 Metals in Common Use:
Metals Discovered in the 18th Century:
Metals Discovered in the 19th Century:
1803 Iridium, Palladium, Rhodium
1807 Potassium, Sodium 1808 Boron, Barium, Calcium, Magnesium, Strontium
1817 Lithium, Cadmium, Selenium
1843 Erbium, Terbium
1860 Cesium, Rubidium
1878-1885 Holmium, Thulium, Scandium, Samarium, Gadalinium,Praseodynium,
1898 Polonium, Radium
Metals Discovered in the 20th Century:
1940-61 Transuranium elements. Neptunium, Plutonium, Curium, Americum Berkelium,
Californium, Einsteinium, Fermium, Mendelevium, Nobelium, Lawrencium, Osmium, Ytterbium.
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