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Chemistry 2/3

1=chp 2/3

TermDefinition
Atomic Number The number of protons in the nucleus of an atom of an element.
Diffusion Spontaneous spreading out of a substance due to the natural movement of its particles
Element A substance that cannot be broken down into simpler substance by chemical means
Mass Number The number of protons and neutrons in an atom of element
Pauli Exclusion Principle No more than two electrons can occupy an orbital, and this they can only do if they have opposite spin.
Relative Atomic Mass (Ar) The mass of an atom of an element compared with one twelfth of the mass of the carbon-12
Relative Molecular Mass (Mr) The mass of molecule of than 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 Thomoson Discovered the electrons in 1897
George Stoney Proposed the name 'electron'
Cathode Rays Streams of negatively charged particles (electrons) than 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 1932
Emission Spectrum Pattern of bright liner or bands seen when the electromagnetic radiation emitted by a substance is passed through a spectrometer
Mass Spectometry Technique dot the determine the masses of particles and structures of molecules
Molecules The smallest particle of a substance that sill retains the physical and chemical properties of than substance
Created by: Marcos.vm
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