Question

uranium is an element that is often used in nuclear power plants. uranium atoms are very large, and the substance can be dangerous if it is not carefully contained.
what is true about all uranium atoms?
they each have the same number of nuclear particles.
they each have the same number of neutral particles.
they each have the same number of neutrons.
they each have the same number of protons.

Explanation:

Atoms of the same element (in this case, uranium) have the same number of protons. The number of neutrons can vary (isotopes), and "nuclear particles" is too vague. "Neutral particles" is also incorrect as the key defining characteristic for an element is the proton number.

Answer:

They each have the same number of protons.