An ion has 79 protons, 76 electrons, 116 neutrons. What is the correct formula of the ion?

Answer 1

#"Au"^{3+}#

First, determine the element based on the number of protons—79 protons is the symbol for gold, or Au.

An atom of gold has 79 electrons when it was first created (electron count must match that of the proton in order for an atom to be electrically neutral). Since it now only has 76 electrons, it has lost 3 electrons, resulting in a state of +3.

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Answer 2

Xavier Avery

The ion with 79 protons, 76 electrons, and 116 neutrons has the correct formula (^{195}_{79}\text{Au}^{3+}).

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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.