Aluminium has a mass number of 27, and an atomic number of 13. How many electrons, protons and neutrons?
- protons = 13, electrons = 11, neutrons = 14
- protons = 13, electrons = 12, neutrons = 27
- protons = 13, electrons = 13, neutrons =14
- protons = 13, electrons = 27, neutrons =13