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-Matter made of small indivisible atoms
-Atoms can’t be subdivided, created, destroyed
-Atoms of different elements can form compounds -
-Discovered radioactivity, and resulted in dying to it.
-Received 2 nobel prizes, one for physics and one for chemistry -
-An atom is electrically neutral, no charge.
-Both positive and negative charges are equal in the atom
-An atom is made out of a sphere of positive charges with negatively charged electron embedded in it -
-Precisely determined the magnitude of the electron charge
-Received Nobel Prize for “his work on the elementary charge of electricity and on the photoletric effect -
-Atoms are mostly empty space
-Most of the mass is concentrated in the center of the atom, which is called the nucleus
-Electrons are located outside the nucleus. -
-Electrons orbit the nucleus in orbits that have specific shape and size
-The energy of the orbit is related to its size. The lowest energy is found in the smallest orbit.
-Electrons move in orbits, they move between shells when gaining or losing energy -
-Electrons don’t move around the nucleus in orbits
-Electrons exist in a cloud with specific energy levels
-The electron cloud exists in a region with negative charges only, surrounding the nucleus. -
-Discovered the neutron and its mass
-Worked with Ernest Rutherford -
-Awarded Nobel prize in 1932
-Involved with the theory of quantum mechanics
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