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1863
John Newlands has organized the only known 56 elements into 11 seperate groups based on the structure of the atom. -
1869
Dimitri Mendellev used John Newlands' method of grouping and the way of grouping elements into what they are now known in their periodic groups. They had been arranged in rows and columns, he left spaces for elements that had yet to be discovered! -
1897
Sir Ramsay and Lord Rayleigh discovered the noble gases and added these to the periodic table as group O. -
1900
Antoine Becquerel found out that electrons and beta particles were the same thing... -
1809
1809 - By this time 47 elements had been discovered and name, scientists started to see patterns in atom structures! -
1911
Ernest Rutherford had discovered that electrons' orbit and he found out that the electrons in the outer bit were in more supply compared to the inner orbit. -
1914
Ernest Rutherford has found out that protons were in the nucleus! -
1914
Henry Moseley labeled the elements with atomic numbers based on the number of electrons in the atom rather than their atomic mass! -
1932
James Chadwick discovered neutrons and identifies isotopes. -
1932
A man named James Chadwick discovered neutrons identified Isotopes.