Chemistry Atoms 3.0 / 5 based on 1 rating ? ChemistryGCSEAQA Created by: Pixie~Flirt (:Created on: 12-09-12 16:38 The Nucleus Middle of atom has protons and neutrons positive charge whole mass of atom, concentrated in nucleus tiny compared to rest of atom 1 of 5 The Electrons move around nucleus negatively charged tiny, cover a lot of space volume of orbits determines size of atom no mass occupy shells around nucleus 2 of 5 Particle, Mass and Charge Proton Mass: 1 Charge: +1 Neutron Mass: 1 Charge: 0 Electron Mass: very small (0) Charge : -1 3 of 5 Number of Protons Equals Number of Electrons Neutral atoms: no charge Charge on electrons same size as charge on protons but opposite Number of protons equals number of electrons in neutral atom electrons added or removes, atom is charged, then an ion 4 of 5 Atomic Number and Mass Number atomic number: number of protons atoms of same element, same number of protons neutrons, minus atomic number from mass number mass number: biggest number mass number maybe double proton number same number of protons and neutrons in nucleus 5 of 5
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