Question

The symbol P represents the element phosphorus. This element’s atomic number is 15. How many protons and electrons are in a P–3 ion?

15 protons and 3 electrons
12 protons and 15 electrons
15 protons and 18 electrons
18 protons and 15 electrons

Answer 1

A charge of -3 means it gained 3 electrons meaning electrons would go from 15 to 18 because protons and electrons are the same and you start with 15.
So your answer is 15 protons, 18 electrons

Answer 2

The number of proton will be 15 and number of electron will be 18.

What is proton?

In the nuclei of atoms, the proton is just a basic electrically charged particle with neutrons. The p symbol is used to represent it.

What is electron?

The electron is just a subatomic particle with a negative electric charge. It will find  easily in the surrounding nucleus. They are assumed to be elementary particles.

Calculation of number of proton and number of neutron shown below:

It is given that the atomic number of phosphorus is 15 . After adding three more electrons in the outermost orbital of the  phosphorus atom , new atomic number will be 18.

The atomic mass of the  phosphorus = 31.

The number of proton = number of electron = atomic number

So, the number of proton = 15

Due to gaining 3 electrons , the number of electrons will be 15+3 = 18

Therefore, the number of proton will be 15 and number of electron will be 18.

To know more about proton and electron.

https://brainly.com/question/13131235.

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