Question

4. The radius of a hydrogen atom is

0.000000000025 meter. How would you
express this radius in scientific notation?

Answer 1

2.5×10^-11

Explanation:

Put the point in the middle of 2 and 5 and count how many times you need to get there ...

like 0.05 to put point after 5 you have to jump 2 steps so it is 5×10^-2.