How many valence electrons does an ion with 15 protons have?

Answer 1

This element is phosphorus and it has five valence electrons.

Two methods exist for us to ascertain this: first, phosphorus is the element with 15 protons, or atomic number 15. Phosphorus belongs to group 15/VA, and all elements in that group have 5 valence electrons.

Another way we can answer this question is to write the electron configuration for a neutral phosphorus atom, which would have 15 electrons: #"1s"^2"2s"^2"2p"^6"3s"^2"3p"^3"#. The highest energy (outermost) #"s"# and #"p"# sublevels make up the valence shell. So according to the electron configuration, there are #5# electrons in the valence shell.
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Answer 2

An ion with 15 protons, corresponding to the element phosphorus (P), would have five valence electrons.

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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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