in chemistry how does an arom move arund the nucleaus
An atom consists of a nucleus surrounded by a 'cloud' of electrons. The nucleus is compose of protons and neutrons in most cases (Hydrogen only has a proton in the nucleus.) Based on this description the nucleuos is part of the atom so the atom does not move around the nucleus.
The question might be better stated as 'In an atom, how do electrons move around the nucleus?'
This depends on what level of quantum mechanics you are using to describe the atom. In the Bohr Model, created in the early 20th century, the electrons moved in disctinct orbits govern by electromagnetic forces between the nucluse (it has a net positve charge) and each electron (each has a negative charge). As quantum mechanics progressed, the 'Heisenberg Uncertainty Principle' dictated that the momentum and position of a particle could not be simultaneously defined exactly (Δx * Δp ≥ h/2*Pi, where x = position, p=momentum, h= Planck's constant). With this constraint the location and movement of an electron near the nucleus is 'uncertain'. Thus physicists and chemists talk about an electron as being distributed around the nucleus...in a 'cloud'. (No, not the cloud connected to your phone! ;-) )
These two descriptions of the electron's behavior highlight two competing ideas in physcis: Is the universe deterministic (like the Bohr model) or does the universe behave in a probabalistic manner (as decscribed by Heisenberg's uncertainity principle).
Food for thought!