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Chemistry 5th year

Chemistry Ms. Lennon

Dalton's Atomic Theory Daltons Atomic Theory may be stated as follows, 1. All matter is made up of very small particles called atoms. 2. All atoms are indivisible. They cannot be broken down into simpler particles.
Crookes Cathode ray experiments - Maltese cross - Paddle wheel
Thompson -Discovered electron -e/m formula
Stoney He coined the name 'electron'
Miligan Oil drop experiment discovered charge of electron
Rutherford Bombarded small particles with alpha particles (helium nucleus, 2protons and 2 neutrons) and discovered small positively charged particles were given out , protons.
Rutherford Gold foil experiment, Discovered nucleus and put forward the idea of an atom as having a dense positively charged nucleus and an electron cloud surrounding the nucleus.
Chadwick Bombarded beryllium with alpha particles and discovered that neutral charged particles were released called neutrons.
Name equipment to view emission spectra Spectrometer and spectroscope.
Salt colours -flame test Lithium Crimson
Salt colours -flame test Potassium Lilac
Salt colours -flame test Barium Green
Salt colours -flame test Strontium Red
Salt colours -flame test Copper Green/blue
Salt colours -flame test Sodium Yellow
What is an energy level An energy level is defined as the fixed energy value that an electron in an atom may have.
Ground state The ground state of an atom is one in which the electrons occupy the lowest available energy level.
Excited state The excited state of an atom is one in which the electrons occupy higher energy levels that those available in the ground state.
E2-E1 = Hf E2 = Excited state, E1 = ground state, H = Planck's constant f = frequency
Heisenberg's uncertainty principle States that it is impossible to measure at the same time both the velocity and the position of the electron
An orbital is a region in space within which there is a high probability of finding an electron
A sublevel A sublevel is a subdivision of a main energy level and consists of one or more orbitals of the same energy.
Created by: mlennon