Which of the following statements does not describe the structure of an atom? inside the nucleus of an atom are protons and neutrons. protons are positively charged sub-atomic particles. electrons are negatively charged sub-atomic particles. most of the mass of an atom comes from the electron cloud.

Most of the mass of an atom comes from the electron cloud

Explanation:

Protons are positive, Electrons are negative, and there are only protons and neutrons in the nucleus of an atom. Also there are only 6 electrons in a electron cloud and the mass of an electron is 1/1,836 the mass of a proton. So it would be the last answer.

practical process described pest part of scientific investigation.

because practical knowledge is powerful then therotical knowledge.