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If you to know the number of protons in an atom of a given element, what would you look up?

Answer 1

If you are doing your chemistry homework there should be one beside you now!

And you would look up a #"Periodic Table"#. Such a #"Tables"# are always allowed in ANY chemistry or physics examination. It lists elements according to #Z#, their atomic number, and arranges the elements in Groups, which reflects their electronic structure.

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Answer 2

Serenity Allen

atomic quantity.

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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.