Question

Our understanding of the atom has changed over time. Which idea that was once accepted is now considered scientifically inaccurate?
a. The nucleus is the center of the atom.
b. An atom is solid material.
c. Electrons are arranged in layers.
d. Electrons have a negative charge.

Answer 1

"b. An atom is solid material" would be an example of something that is now considered scientifically inaccurate, since we now know that the atom is actually mostly open space.