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The nucleus is made of one or more protons and typically a similar number of neutrons. More than 99.94% of an atom's mass is in the nucleus.
That means this element in its neutral state has 9 electrons.
For Aluminium, with the symbol Al, there are 13 protons and so we have 13 electrons. The nucleus is a solid core, and that core is covered by shells of electrons.
Through the development of physics, atomic models have incorporated quantum principles to better explain and predict the behavior.
Every atom is composed of a nucleus and one or more electrons bound to the nucleus.
In older stars that have burned most of their hydrogen, leftover helium accumulates.