Question

find the element: protons: 8 neutrons: 9 electrons: 10

Explanation:

Step1: Identify element by protons

The number of protons determines the element. An element with 8 protons is oxygen (O) on the periodic - table.

Step2: Consider ion state

The number of electrons is 10 while the number of protons is 8. This means the species has a charge of 2 - negative (since electrons are negatively charged and there are 2 more electrons than protons), making it an oxide ion ($O^{2 - }$). But the base element is still oxygen.

Answer:

O