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Question:

Which of the following statements is true about protons?

A The number of protons in the nucleus is the defining property of an element.
explanation

A proton is a subatomic particle that has a charge of +1. Every atom has at least one proton in its nucleus. The number of protons in the nucleus is the defining property of an element and is referred to as the element’s atomic number. For example, any atom with one proton must be hydrogen; any atom with six protons must be carbon.