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15 facts about precious metals
1. Precious metals - metals are not subject to corrosion and oxidation, which distinguishes them from the majority of metals. All of them are also precious metals, due to their rarity. Basic precious metals - gold, silver and platinum and other platinum group metals is 5 - (ruthenium, rhodium, palladium, osmium, iridium). Some authors have referred to as noble metals and technetium, which is not found in nature (besides it is radioactive with short half-life).
2. Gold - it's so rare metal that one hour in the world is more iron than in the history of the gold found.
3. Platinum previously considered "wrong silver" and thrown into a river or sea, in order not to get underfoot. Only later, when jewelers from Spain found that the fine platinum alloyed with gold, it was used as a raw material jewelry.
4. «Aqua regia" - that is a mixture of hydrochloric and nitric acid. This "cocktail" dissolves gold.
5. interesting that native silver occurs much less frequently than native gold, but the total amount of gold in the world is much less than silver. Here's a paradox.
6. In 1828, the year in Russia produced platinum coins of 3, 6 and 12 rubles. At that time, platinum was worth half the price of silver.
7. Gold - a great conductor, is therefore an essential raw material in the electrical industry.
8. In Russian - "Silver" in English - "Silver", in German - "Silber" - all these words are derived from the ancient Indian word "Sarpa", which stands for the moon and crescent.
9. In ancient Egypt, gold particles believed the gods, so they were not allowed to own anyone but Pharaoh.
10. The largest nugget of silver was found in Chile and weighed 1420 kg.
11. Precious metals such as gold, platinum, silver and palladium do not react chemically with the body. That is why these metals are actively used in medicine and jewelry industry.
12. Olympic medal, handed in 1912, were made of pure gold. In today's world of sports medals they cover only 6 grams of metal.
13. In 1933, Frank Roosevelt signed a decree that forbade US citizens kept at gold. Violation of this decree is punishable by a fine of 10 thousand dollars or ten years' imprisonment.
14. is a Russian leader in the production and supply of palladium in the world market.
15. Gold 999th sample is so soft that it can be easily scratched with a fingernail.
A selection was: Popilon
via factroom.ru
