Complete each of the following sentences
An atom's _________ is equal to the number of protons in nucleus.

Explanation

To complete the sentence, we need to identify the term that describes the number of protons in an atom's nucleus.

1. **Understanding Protons**: Protons are subatomic particles found in the nucleus of an atom. They carry a positive charge and are one of the key components that define an atom.

2. **Defining Atomic Number**: The atomic number is defined as the number of protons present in the nucleus of an atom. It is a unique identifier for each element, as no two elements can have the same atomic number.

3. **Completing the Sentence**: Based on the definition of atomic number, we can complete the sentence as follows: "An atom's atomic number is equal to the number of protons in the nucleus."

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