The Atom 0.0 / 5 ? ChemistryAtomic StructureA2/A-levelAQA Created by: iloverevision:)Created on: 21-05-19 14:06 The Structure of the Atom protons, neutrons, electrons most of mass of atom concentrated in nucleu relative mass & charge is used electron: -1, 1/200 mass proton: +1, 1 mass neutron: 0, 1 mass 1 of 3 Mass Number & Atomic Number mass number: top of element, number of protons & neutrons in nucleus of atom atomic (proton) number: bottom of element, number of protons in nucleus - identifies element all atoms of same element have same number of protons sometimes atomic number is left out of nuclear symbol as the symbol tells you its value for neutral atoms: number of electrons is same as number of protons number if neutrons is mass number - atomic number atoms form ions - losing/gaining electrons ions have different numbers of protons & electrons negative ions - more electrons than protons positive ions - fewer electrons than protons 2 of 3 Isotopes atoms with same number of protons but different number of neutrons number & arrangement of electrons decides chemical properties isotopes have same configuration of electrons - have same chemical properties isotopes do have slightly different physical properties physical properties depend more on mass of an atom 3 of 3
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