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Democitus
Democitus was born in 460BC and died in 370BC.
He claimed that everything is made up of atoms.
He was a pupil of Leucippus, who formed what is thought to be the first atomic theory.
We now know that everything is made up of atoms. -
Antoine Lavoisier
Antoine Lavoisier was born in 1743 and died in 1794.
He found that compounds containing more than one element always had the same relative amounts of each element. Scientists thought this was good so this is now called ‘The Law of Constant Composition’.
We now know that they all have to have the same amount of elements. -
John Dalton
John Dalton was born in 1766 and lived until 1837.
His most important contribution to science is called the atomic theory. It consists that matter is composed of atoms of differing weights and combine in a simple ratio’s weight.Not all the scientists agreed with his theory.
Found that there was a point where matter couldn’t be broken down into anything smaller.The word atom is used to describe these tiny particles.It was a long time before his ideas were recognised. -
Robert Brown
Robert Brown was born in 1773 and died in 1858.
His discovery was the movement of tiny pollen grains being affected by ‘invisible’ particles'. Scientists thought this was a good idea so they named his discovery ‘The Brownian Motion’.
There were invisible particles in the water that the pollen particles were bumping into, causing the particles to change direction. -
Dmitri Mendeleev
Dmitri Mendeleev was born in 1834 and died in 1907.
He formulated the Periodic Law and created his own version of the periodic table of elements and because of this we can learn about the periodic law. Chemists influenced him and inspired him to pursue his work. -
J.J Thomson
J.J Thomson was born in 1856 and died in 1940.
He dscovered electrons and isotopes, and inventing the mass spectrometer. His early education took place in small private schools where he demonstrated great talent and interest in science.
Because of his learning, we now know what the things that he discovered are and what they do. -
Max Planck
Max Planck was born in 1858 and died in 1947.
His fame rests primarily on his role as originator of the quantum theory. This theory revolutionized human understanding of atomic and subatomic processes.
Scientists thought that this was a wonderful theory. -
Robert Millikan
Robert Millikan was born in 1968 and died in 1953.
He was a Nobel laureate in physics for his measurement of the charge on the electron and for his work on the photoelectric effect. We now have a greater idea of electrons and what they are like and how they work.
His work on electrons was appreciated greatly. -
Ernest Rutherford
Ernest Rutherford was born in 1871 and died in 1937.
He stablished that the nucleus was very dense, small and positively charged. He also discovered that electrons were located outside of the nucleus. People agreed with what he was saying and doing to do with his theories and this pushed him to continue.
We now know that the nucleus and electrons are different to what we originally thought. -
Hans Geiger
Hans Geiger was born in 1882 and died in 1945.
He was the co-inventors of the Geiger-Marsden experiment which discovered the Atomic nucleus. We are now clear that there is a nucleus in all atoms.
He looked up to other scientists in order to become who he was. -
Niels Bohr
Niels Bohr was bron in 1885 and died in 1962.
He developed the Bohr model of the atom with the atomic nucleus at the centre and electrons in orbit around it, which he compared to the planets orbiting the Sun. He developed the Bohr model of the atom with the atomic nucleus at the centre and electrons in orbit around it, which he compared to the planets orbiting the Sun.
Because of this, we now know more about the atom in more depth. -
Erwin Schrodinger
Erwin Schrodinger was born in 1887 and died in 1961.
He developed a number of fundamental results in the field of quantum theory. He looked up to people who were studying about atoms and he learnt from them.
By doing all this, he has helped us understand the quantum theory. -
Ernest Marsden
Ernest Marsden was born in 1889 and died in 1970.
He was a co-owner of the Geiger-Marsden experiment supervision from Rutherford in 1909.
He had support from other people to help him succeed. -
James Chadwick
James Chadwick was born in 1891 and died in 1974.
He made one very important discovery which was proving that atoms do in fact exist.
Thanks to this, we now have a definite answer whether neurons actually exist or not so thanks to him, we know for sure. -
Aristotle
Aristotle was born in 384BC and died in 322BC.
He developed a theory that was based on the four elements (fire, water, air and earth).
We now know more about the elements and what they really mean.
