Identify the factor that distinguishes each element from every other element in the periodic table ?

The number of protons in the nucleus

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The number of neutrons in the nucleus

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The number of electrons about the nucleus

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The total mass of the nucleus (protons plus neutrons)

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Its position in the periodic table

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Solution

The correct option is A The number of protons in the nucleus
The number of protons is the deciding factor when distinguishing one element from another. Variation in the number of electrons or neutrons does not change the type of element. Changing number of electrons produces ions, while changing the number of neutrons produces isotopes. The modern periodic table is organized in order of increasing atomic number or the protons.

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