If The Atomic Number Is 11 How Many Electrons Does The Atom Have Explain?

You cannot know for sure without more information. An electrically neutral sodium atom (sodium has at. No. 11) will have the same number of electrons as protons; atomic number tells you the number of protons, so this atom has 11 protons and would have 11 electrons if electrically neutral, however, if the atom is charged, it could have more or fewer electrons. Sodium atoms in stars are highly ionized and may have just a few if any any electrons.