Atomic Theory Timeline Song
Words by Christy Johannesson
To the tune of the “Alphabet Song”
Verse 1
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Dalton’s model was the “Billiard Ball”
Atoms are indivisible
Thomson used the Cathode Ray
Electrons are charged in a negative way
His model was “Plum Pudding”
Or a chocolate chip cookie
Verse 2
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Becquerel found by accident
Radiation from an atom went
Oil drops were used by Millikan
To find the mass and charge of an
electron
• While they changed the models none
• They paved the way for others to come
Verse 3
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Rutherford experimented with Gold Foil
To find the nucleus he did toil
Its positive charge and tiny size
Showed that he was rather wise
Electrons moving ‘round the nucleus
Describes the “Nuclear Model” for us
Verse 4
• Bohr said electrons move in orbits
round
• In energy levels they can be found
• This explains the reason behind
• The bright-line spectrum that we find
• “Planetary Model” it was called
• But Bohr knew that it was flawed
Verse 5
• The orbital proposed by Schrödinger
• Described most likely where electrons
were
• Quantum mechanics was the new game
• “Electron Cloud” was the model’s name
• Finally Chadwick found the neutron
• But atomic theory still moves on