PSSA Grade 8 Science Practice Questions - Pennsylvania System Of School Assessment (PSSA) Grade 8 Science Exam

The atomic number of an element on the periodic table represents which of the following?

The total number of protons in the nucleus of an atom The combined total number of protons and neutrons The total number of neutrons minus the number of electrons The average atomic mass of all naturally occurring isotopes

Correct Answer:

The total number of protons in the nucleus of an atom

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