The atomic number tells the number of what two items in an atom?

Answer 1

Well, #Z#, #"the atomic number"# gives (i), the number of protons, massive, fundamental positively charged nuclear particles.

And (ii), the number of electrons, fundamental negatively charged particles of negligible mass that are conceived to whizz about the nuclear core; of course electrical neutrality demands that #Z# and the number of electrons be equal.

#Z# determines the identity of the atom.........#Z=1,H; Z=2, He,,# #Z=3, Li.............................Z=92, U#.

See

https://tutor.hix.ai

for a description of #"isotopes"#, which are provide further details with respect to atomic structure.

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Answer 2

Jeremiah Adams

The number of protons and electrons in an atom is indicated by its atomic number.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.