Atoms Atoms are the building block of all matter and are the simplest form of molecule. They are...
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History Of AtomsBy: Dana Zahra 7D
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Atoms Atoms are the building block of all matter and are
the simplest form of molecule. They are all made up of protons, neutrons and electrons. They look something like this:
The nucleus:This contains neutrons and protons.
Electrons:These orbit around the nucleus
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Timeline
The ideas of the structure of the atom changed over time.
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Democritus 460-370 BC
450BC
One of the first scientists to study the Atom, he thought that all atoms are made of small indestructible particles, and that there are an many atoms and are all in different shapes and sizes.
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John Dalton1766-1844
AD1803 AD
He found out that different elements have different atoms and that all atoms of the same element are identical.
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Eugene Goldstein1850-1930
1886 AD
He discovered the existence of the proton and the positively charged particles.
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Joseph John Thomson
1856-1940
1897 AD
Joseph Thomson discovered the electron. He also invented the Plum-Pudding model, in his model electrons and protons are mixed together.
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Albert Einstein
1879-1955)1905 AD
Einstein found out the light was an amount of energy called photons.
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Robert Millikan
1868-19531909 AD
Robert found out the actual charge and weight of an Electron.
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Ernest Rutherford 1871-1937
1911 AD
In his Gold-Foil experiment he discovered that the atom was mostly empty but had a solid center that is the nucleus.
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Niels Bohr1885-1962
1913 AD
Bohr discovered that electrons are found in circular paths called orbits which move around the nucleus.
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Louis de Broglie
1892–19871923 AD
He found out an equation which shows that particles of matter sometimes behave as waves.
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Erwin Schrödinger1887-1961
1926 AD
He invented an equation which could describe energy waves.
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James Chadwick1891-1974
1932 AD
He discovered the other part of a nucleus of an atom that has no electrical charge called the neutron.
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The ideas of the structure of the atom have changed over time since the technology and sources have improved and also by taking another idea of someone else and improving and building on it.
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Bibliography:http://www.kori-designs.com/Chem%20Timeline/
atomictimeline/http://www.google.com.qa/http://www.chem4kids.com/