Question

An ion with 11 protons 12 neutrons and a charge of + 1 has an atomic number of

what? And how many electrons total?

Answer 1

11 electrons total and 23amu

Step-by-step explanation:

This tells us that sodium has 11 protons and because it is neutral it has 11 electrons. The mass number of an element tells us the number of protons AND neutrons in an atom (the two particles that have a measurable mass). Sodium has a mass number of 23amu.