An atom is

A

the smallest particle of matter known

B

the smallest particle of a gas

C

the smallest indivisible particle of an element that can take part in a chemical change

D

radioactive emission

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**Step-by-Step Solution:** 1. **Understanding the Definition of an Atom:** - An atom is defined as the smallest unit of matter. It is the basic building block of all substances. 2. **Origin of the Term:** - The word "atom" comes from the Greek word "atomos," which means "indivisible." This indicates that atoms were once thought to be the smallest particles that could not be divided further. 3. **Atoms in Relation to Matter:** - Matter is anything that occupies space and has mass. Atoms make up all matter, meaning that everything around us is composed of atoms. 4. **Role of Atoms in Chemical Reactions:** - Atoms are involved in chemical reactions. They can combine, rearrange, or break apart during these reactions, but they themselves remain unchanged. 5. **Final Definition:** - Therefore, an atom can be defined as the smallest indivisible particle of an element that can take part in a chemical change. **Conclusion:** - The correct definition of an atom is: "An atom is the smallest indivisible particle of an element that can take part in a chemical change." ---
**Step-by-Step Solution:** 1. **Understanding the Definition of an Atom:** - An atom is defined as the smallest unit of matter. It is the basic building block of all substances. 2. **Origin of the Term:** - The word "atom" comes from the Greek word "atomos," which means "indivisible." This indicates that atoms were once thought to be the smallest particles that could not be divided further. ...
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