Question

which of the following best describes atoms?
atoms are made of uniform sphere called a nucleus surrounded by electrons.
atoms are hard, solid balls of matter that are the smallest known particles.
atoms are composed of electrical charges that are made only of energy.
atoms are made of three particles called electrons, neutrons, and protons.

Explanation:

Atoms consist of a nucleus containing protons and neutrons, surrounded by electrons. This is the modern - accepted structure. The first option is incorrect as the nucleus is not a uniform sphere. Atoms are not hard, solid balls as in the second option; they have a complex internal structure. Atoms are not just electrical charges made only of energy as in the third option.

Answer:

Atoms are made of three particles called electrons, neutrons, and protons.