# The diameter of a carbon atom is 0.000000000154 m. What is this number expressed in scientific notation?

Jun 13, 2016

$1.54 \times {10}^{- 10}$.

#### Explanation:

Move the decimal point until you have one nonzero digit to the left of it. The number with the decimal point moved is $a$, the number of places you moved the decimal point is $n$, and then you have

$a \times {10}^{n}$ if you moved the decimal point to the left

$a \times {10}^{- n}$ if you moved the decimal point to the right

$a \times {10}^{0}$, because $n = 0$, if you did not have to move the decimal point