Question

atto is expressed as​

Answer 1

Answer:

Atto (symbol a) is a unit prefix in the metric system denoting a factor of 10−18 or 0.000000000000000001. The unit multiple was adopted at the 12th General Conference on Weights and Measures (CGPM) in Resolution 8. It is derived from the Danish word atten, meaning "eighteen".

Explanation:

$\:$

Answer 2

Answer:

10⁻¹⁸ meter

Explanation:

An attometer is referred to 10⁻¹⁸ meter meters.

Hope my answer helped you :)