1- Particles that make up most of the mass of an atom are________and__________?

2-the particle that makes up most of the volume of an atom is _______?

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1) protons and neutrons

2) electron

1.) protons and neutrons

2.) Electrons

1- The particles that make up most of the mass of an atom are protons and neutrons. To determine this, we can refer to the atomic structure. Protons and neutrons are found in the nucleus of the atom. Protons have a positive charge, while neutrons have no charge. These particles have relatively high masses compared to other particles in an atom.

2- The particle that makes up most of the volume of an atom is the electron cloud or electron shell. To understand this, we need to consider the arrangement of electrons in an atom. Electrons are negatively charged particles that orbit around the nucleus in specific energy levels or electron shells. The volume occupied by these electron shells accounts for most of the space within an atom. Although electrons have a significantly smaller mass compared to protons and neutrons, their arrangement and distribution around the nucleus give rise to the atom's volume.