Which term describes technology that operates on an atomic level?

a) electromagnetic

b) nanoscale

c) biochemical

d) invisible

B. Nanoscale

Because Nano - mean small and you're measuring something on a 'scale'

The term describes technology that operates on an atomic level is:

b) nanoscale.

Explanation:

Remember that the word atomic comes from the word atom, and since an atom has an approximate size of 0.1 nanometers, regularly all technology that has similar sizes is often called nanotechnology or nano-scale technology. This technology is extremely interesting in the field of medicine, since it is expected to be able to create robots of similar sizes to an atom that can easily access and repair any organ without the need for invasive surgeries.