Inflation is the rate at which the general level of prices for goods and services is rising and, consequently, the purchasing power of currency is falling. Central banks attempt to limit inflation, and avoid deflation, in order to keep the economy running smoothly. Next Up.
If you are not allergic to metal, the reason for this reaction is chemical. It's due to a combination of the metal and the acids in your skin. Experts say that there are several metals that oxidize with your skin to give you a noticeable green ring around your finger. A ring made of copper is a common culprit, but even silver and gold metals can cause discoloration.
The colour of metals such as silver and gold is mainly due to absorption of light when a d electron jumps to an s orbital. For silver, the 4 d â5 s transition has an energy corresponding to ultraviolet light, so frequencies in the visible band are not absorbed.ith a single 6 s electron, you might expect gold to be highly reactive; after all, c sium has the same 6 s 1 outer shell, and it is the most alkaline of natural elements: it explodes if dropped in water, and even reacts with ice.