Models of Atom
Labels:
Radiologic Physics
·
1. John Dalton – his model showed that the elements could be classified as to integral
values of atomic mass.
Ø
elements
were composed of identical atoms acting the same way in a chemical reaction.
Ø “hook and eye model “to account for chemical
combination.
2. Dmitri Mendeleev – showed that if the elements are arranged in order of increasing
atomic mass, repetition of similar chemical properties occurred.
Ø developed
the first periodic table of elements.
3.
J.J. Thomson – described that electrons were an integral part of all atoms.
Ø His model of the atom has been described as a “ plum pudding “, with
the plums representing the electrons.
4. Ernest Rutherford – introduced the nuclear model, which described the atom as containing
a small dense, positively charge center surrounded by a negative cloud of
electrons. He called the center of the atom the nucleus.
Ø introduced the nuclear model
5. Neils Bohr – his model was a miniature solar system in which the electrons
revolved around the nucleus in prescribed orbits or energy levels.
Ø
Improved
Rutherford’s description of an atom.
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