Heavy metals only mercury, lead and bismuth meet all of them. Despite this lack of agreement, the term (plural or singular) is widely used in science. A density of more than 5 g/cm is sometimes quoted as a commonly used criterion and is used in the body of this article. The earliest known metals—common metals such as iron, copper, and tin, and precious metals such as silver, gold, and platinum—are heavy metals. From 1809 onwards, light metals, such as magnesium, aluminium, and titanium, were discovered, as well as less well-known heavy metals including gallium, thallium, and hafnium. Some heavy metals are either
Taxation of precious metals same "intra-community transaction" rules to all of Europe on a bilateral basis resulting in legally tax-free silver coin availability throughout all of Europe. Precious metals are subject to tax as collectibles, with any profit being taxed at the collectibles capital gains rate. This is normally the standard income tax rate, with metal held over 1 year is subject to a maximum of 28%. Note that many people unfamiliar with the collectibles tax rates (including some well-known websites) incorrectly think that precious metals are taxed at a flat 28% (because they interpret the word "maximum" in "maximum 28% rate"). Taxation of