Q: An element is defined by the number of ____ it contains?


Read this paragraph and choose the correct option from the provided answers:

An element is defined by the number of protons it contains. All atoms of a given element contain the same number of protons. The number of neutrons in an element may vary. Atoms of an element with different numbers of neutrons are called isotopes .

 Choices:

- particles

- neutrons

- electrons

- protons


A:
protons