# Give the ion symbol for the the ion that has 15 protons and 18 electrons

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## Question:

Give the ion symbol for the the ion that has 15 protons and 18 electrons

The symbol for the ion that has 15 protons and 18 electrons is P³¯

We’ll begin by defining what an ion is.

An ion is an atom or a group of atom with a charge. The charge can be either positive (+) or negative (-) depending on how the ion is formed.

### NOTE:

1. The ion will be positive if the element involved loses an electron(s)

2. The ion will be negative if the element involved gained an electron(s).

To solve the question given above, we’ll begin obtaining the symbol of the element. This can be obtained as follow:

From the question given above, we were told that the ion has 15 protons. This (i.e 15 protons) is the atomic number of the element

Now, comparing the atomic number (i.e 15 protons) of the element with those in the periodic table, the element whose ion we are looking for is Phosphorus with a symbol of ‘P’.

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Next, we shall determine the charge of the ion. This can be obtained as follow:

Proton = 15

Electron = 18

### Charge =?

Charge = Proton – Electron

Charge = 15 – 18

### Charge = –3

Finally, we shall determine the symbol of the ion. This is illustrated below:

Charge = –3

Element = Phosphorus

Symbol of element = P

Thus,

### Symbol of ion = P³¯

Therefore, the symbol for the ion that has 15 protons and 18 electrons is P³¯

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