"G" usually refers to the term "Giga". In decimal, one giga-something is 1000 mega-somethings, a mega is 1000 kilos, and a kilo is a thousand units. So a Giga-something would be a billion of the original somethings (or a thousand-million if you're European).
The trick here is that if you're talking in computer terms, then we wouldn't use the number 1000, but 1024. This is because 1024 is a power of 2 (two to the power of ten). In that case, a "giga" is 1024 "megas", which is 1024 "kilos", which in turn is 1024 single units.
So a Gig in normal decimal would be 109
In Binary, it would be 230
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The power is -12 or a trillionth.
10-2
The abbreviation "pico" represents the decimal power of 10 to the power of -12, or 10^-12. This means that one picometer (pm) is equal to 10^-12 meters. The prefix "pico" is derived from the Spanish word "pico," which means small or peak, indicating a very small value in the metric system.
atomic mass
The binary number 10000000 represents the decimal 128