Question

give the ion symbol for the ion that has 15 protons and 18 electrons.

Explanation:

Step1: Determine the element

The number of protons determines the element. With 15 protons, the element is phosphorus (P).

Step2: Calculate the charge

The charge of an ion is calculated as \( \text{Charge} = \text{Number of protons}-\text{Number of electrons} \).
Substituting the values: \( \text{Charge}=15 - 18=- 3\)

Answer:

\(P^{3 -}\)