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 have a negative charge.

D.
Electrons are arranged in layers.

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 have a negative charge.
	
 
D.
	Electrons are arranged in layers.

aaronq · Answer

I would say B is not correct, because at the atomic level, solid, liquid, gases all "look" the same. It's the spacing between the atoms that defines the state of matter.