Question

an ion from a given element has 15 protons and 18 electrons. what is the symbol for the ion? what is the name of the element? what is the charge on the ion?

Explanation:

Step1: Identify the element

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

Step2: Calculate the charge

Charge = Number of protons - Number of electrons. Given 15 protons and 18 electrons, Charge = 15 - 18=- 3.

Step3: Write the ion symbol

The symbol for the ion of phosphorus with a - 3 charge is $P^{3 - }$.

Answer:

Name of the element: Phosphorus
Charge on the ion: - 3
Symbol for the ion: $P^{3 - }$