You simply have to learn them. Many of the more common elements were discovered and named long before the English language and so their symbols are derived from their original names.
Examples:
Iron = Fe from ferrum
Gold = Au from aurum
Sodium = Na from natrium
Potassiom = K from kalium
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1.77 x 100 is already in scientific notation. The same figure is 1.77 in standard notation.
1.2312 x 10^1
A notation is a system of written symbols used to represent numbers, amounts, or elements in something such as music or math. So scientific notation is the system used by scientists to simplify large numbers. And there isn't just scientific notation there's also stuff like electrical notation or musical notation. Hope this helps!
It is 8.9*10^-5 in scientific notation