Question

the diameter of a hydrogen atom is about 0.000000005 centimeters. what is the best approximation of the length of the diameter of a hydrogen atom? a 5 x 10^-9 cm b 5 x 10^8 cm c 5 x 10^-8 cm d 5 x 10^-10 cm

Explanation:

Step1: Convert decimal to scientific notation

The given diameter is $0.000000005$. To convert it to scientific - notation, we move the decimal point 9 places to the right. When we move the decimal point to the right, the exponent of 10 is negative. So, $0.000000005 = 5\times10^{-9}$.

Answer:

A. $5\times10^{-9}$ cm