1) Has 22 protons and 21 neutrons
2) Has 15 electrons and 19 neutrons
3) oxygen atom of 10 neutrons
4)chromium atom with a mass number of 54
1 Answer
22 protons = titanium. 22+21 = mass number 43 so the isotope, if you need it, is titanium-43.
15 electrons means 15 protons, which is phosphorus. 15+19 = mass number 34 so it’s phosphorus-34.
Oxygen has 8 protons. 8 protons + 10 neutrons = mass number 18 so it’s oxygen-18.
The last one, they give you exactly what you need; it’s either chromium (24 protons) or chromium-54.