Assertion: atom's size | /r/HasProperty | small to measured
Facets:
Source sentences:
text: The electron is by far the least massive of these particles at 9.11×10−31 kg, with a negative electrical charge and a size that is too small to be measured using available techniques.
text: Electrons are by far the smallest of the three atomic particles, their mass and size is too small to be measured using current technology.