How do you determine the atomic number of an element?

Answer 1

Well, given the element, you take a gander at the Periodic Table......

No-one is expected to memorize the Periodic Table at the undergraduate level. The Periodic Table lists #Z#, #"atomic number"#, and average isotopic mass for all the 100 or so known elements. A copy of the Periodic Table will be made available in every Chemistry/Fysics exam you sit as an undergrad or 6th form student.
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Answer 2

The number of protons in an element's nucleus determines 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.

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.

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.

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.

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