-
John Dalton
John Dalton learnt and explained about the weights of atoms. John Dalton found out a really interesting fact which is that atoms can’t be made or be ruined. He also realised that in an element the molecules are made up of identical things. -
John Dalton
John Dalton wrote down the atomic weights for the elements. -
J.J Thomson
Joseph John Thomson found out about electrons. -
Marie Curie
Marie Curie and her husband found polonium and radium which are radioactive elements. She also worked with uranium and thorium which helped her to find the two new radioactive elements. Polonium is named after Poland which is where Marie Curie originated from. -
J.J Thomson
J.J Thomson came up with the idea that an atom has electrons around it. He worked with his student by the name of Ernest Rutherford to try to work out the number of electrons that can be found in an atom. -
Ernest Rutherford
Ernest Rutherford came up with the idea that an atom has a nucleus which is positive and it also has electrons moving around it. He also explained that most of the atom was bare and only the nucleus had the mass. -
Henry Moseley
Henry Moseley discovered the connection between wavelengths and atomic numbers, which is called Moseley’s law. The number of protons that can be found in the nucleus is known as the atomic number. As well, Henry Moseley added some elements that weren’t on the periodic table and he wrote down their numbers. -
Niels Bohr
Niels Bohr made a model on atomic theory that showed positive atoms orbiting electrons. He also realised that electrons have different paths they use to orbit the nucleus as well as the amount of electrons decides the things about the element. -
Francis Aston
Francis Aston created the mass spectrograph which finds the mass of a particular atom or even a molecule. He realised that Hydrogen atoms came in three different types and that they had a mass number of either 2 or 3. Francis Aston also used the mass spectrograph to find out there is 212 natural isotopes. -
Erwin Schrodinger
Erwin Schrodinger elaborated on Niels Bohr’s model. He used maths to help work out where an electron would be in its orbit. The model is similar to a nucleus which has an electron cloud around it. Erwin Schrodinger also explained that you have a better chance of finding an electron in the denser part of the cloud. -
James Chadwick
James Chadwick found that there is a neutron in an atom. He also realised that the number of protons in a particular atom is the atomic number. As well as all this James Chadwick also stumbled upon the fact that protons and neutrons both have the same mass. -
Murray Gell-Mann
Murray Gell-Mann revealed and explained what makes up protons and neutrons. Each single proton or neutron contains three quarks which are either up quarks or down quarks. The charge of the nucleus is formed by the charges in the quarks. Neurons are negative because they have more down quarks and protons are positive because they have more up quarks.
