Scientific notation is often used to represent very large and very small numbers. Actually, you can also express a "normal-sized" number in scientific notation. So, whenever there is a number, you may use scientific notation.
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The Periodic table can be divided into nine families of elements each having similar properties. The families include: Alkali metals Alkaline metals The Transition metals Other metals Metalloids Non-metals Noble gases Rare Earth
Usually only one digit is to the left of the decimal point in scientific notation. For example, 240 is written as 2.4x10^2 while .00035 would be written as 3.5 x 10^-4. In some instances, however rare they are, you may see expressions such as 24x10^1 or 35x10^-3, and so on.
"Rare earths" is a collective name for 17 different elements; pressumably each of them would have a different price.
Im not sure about the atomic mass bit but Lanthanum is a silvery white, malleable, ductile, and soft rare-earth metal xx
Rare by far