Question

go online to explore and explain the makeup and properties of atoms and isotopes. visualizing the atom matter is made of particles, called atoms, that are too tiny to see with even the most powerful microscopes. an atom is the smallest particle of an element that retains its identity in a chemical reaction. atoms are extremely small. a single row of 100,000,000 copper atoms would produce a line only about 1 cm long. because of the creative experiments of many scientists over a long time, we know that atoms are made of even smaller particles called subatomic particles. protons are positively charged subatomic particles. neutrons are subatomic particles with no charge. electrons are negatively charged subatomic particles. an electron cloud surrounds the nucleus, which is the dense central core made of protons and neutrons. diamond and carbon atoms diamonds are made of carbon atoms. nucleus the nucleus is made of protons and neutrons. it accounts for most of an atoms mass. an atomic mass unit is used to measure the mass of subatomic particles. proton symbol: p⁺ charge: 1+ mass: about 1 amu neutron symbol: n⁰ charge: 0 mass: about 1 amu electron cloud the electron cloud, where the electrons are found, takes up most of an atoms volume. it is mostly empty space. electron symbol: e⁻ charge: 1- mass: about 0.0005 amu ① ccc scale, proportion, and quantity which subatomic particles account for most of an atoms mass and volume?

Explanation:

Step1: Analyze mass - related information

The nucleus, made of protons and neutrons, accounts for most of an atom's mass. Protons and neutrons each have a mass of about 1 amu, while electrons have a mass of about 0.0005 amu.

Step2: Analyze volume - related information

The electron cloud, where electrons are found, takes up most of an atom's volume.

Answer:

Most of an atom's mass is accounted for by protons and neutrons (in the nucleus). Most of an atom's volume is accounted for by the electron cloud (where electrons are found).