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High level atomic strucutre and isotopes

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Year 12 AS Chemistry 2.1.1 Atomic Structure and Isotopes 2.1 Atoms and reactions Draw an atom… • What are the subatomic particles present in an atom? • What are their masses and charges? • How does the structure of the atom relate to the Periodic Table? • What is an ion? • What is the mass number? • What is the atomic number? Can it change? • What is an isotope? A level specification Learners should be able to demonstrate and apply their knowledge and understanding of: GCSE Transition Structure of the atom • You learned that the atom consists of a nucleus made up of protons and neutrons. • The nucleus is surrounded by electrons which are arranged in shells. Properties of subatomic particles • Each particle has a tiny mass. • Masses are compared using relative masses. • Proton and neutron virtually the same • Electron mass is negligible, about 1/1836th the mass of a proton. Properties of subatomic particles • A proton has a positive charge (+1). • An electron has a negative charge (-1). • The charge on a proton is equal but opposite to the charge on an electron. • A neutron has no charge (0). • Overall the charge of an atom is 0. • Every atom of an element has the same number of protons (same atomic number) Particle Symbol Relative mass Relative charge Proton p 1 +1 Neutron n 1 0 Electron e- 0.00055 -1 These lines are energy levels occupied by electrons (see later) Atomic information • The particles in an ...
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