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Chp 2/3

1= chp 2/3

TermDefinition
Atomic Number The number of protons in the nucleus of an atom of an element 1
Diffusion Spontaneous spreading out of a substance due to the natural movement of its particles 1
Element A substance that cannot be broken down into simpler substances by chemical means 1
Mass number The number of protons and neutrons in an atom of the element 1
Pauli Exclusion Principle No more than two electrons can occupy an orbital and this they can only do if they have opposite spin 1
Relative Atomic mass (Ar) The mass of an atom of an element compared with one twelfth of the mass of the carbon-12 isotope
Relative Molecular Mass (Mr) The mass of a molecule of that substance compared with one twelfth of the mass of the carbon-12 isotope
Sublevel Part of a main energy level consisting of one or more orbitals of the same energy
J J Thomson Discovered the electron in 1897
George Stoney Proposed the name electron
Cathode Rays streams of negatively charged particles ( electrons) that travel from the cathode to the anode a vacuum tube
Robert Millikan Determined the size of the charge on the electron
Ernest Rutherford Discovered the nucleus in 1911 Discovered the proton in 1919
James Chadwick Discovered the neutron in 1919
Emission Spectrum Pattern of bright lines or bands seen when the electromagnetic radiation emitted by a substance is passed through a spectrometer
Mass spectrometry Technique to determine the masses of particles and structures of molecules
Molecule The smallest particle of a substance that still retains the physical and chemical properties of that substance
Created by: Conormccabe14
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