Atomic Models JOHN DALTON Early 1800s Thought atoms
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Atomic Models
JOHN DALTON �Early 1800’s �Thought atoms were smooth, hard balls that could not be broken into smaller pieces. �All elements are made of atoms. �All atoms of the same element are exactly alike and have same mass. �An atom of one element cannot be changed into an atom of a different element. �Atoms cannot be created nor destroyed, only rearranged. �Compounds are made from atoms of different elements.
JOHN DALTON Atomic Model Object used to represent theory
J. J. THOMSON � 1897 �An atom consists of negative charges scattered throughout a ball of positive charges.
J. J. THOMSON Atomic Model Object used to represent theory
ERNEST RUTHERFORD � 1911 �Rutherford was a student of Thomson. �Positive charge (protons) is located in the center of the atom. �Center is called the nucleus. �Almost all of the atom’s mass is located in the nucleus. �Atom is mostly empty space with the electrons moving around the nucleus.
ERNEST RUTHERFORD Atomic Model Object used to represent theory
NEILS BOHR � 1913 �Bohr was a student of Thomson & Rutherford �Electrons could only have specific amounts of energy, leading them to move in certain orbits. �This model is also compared to planets orbiting in the solar system.
NEILS BOHR Atomic Model Object used to represent theory
MODERN SCIENTISTS � 1920’s �Electrons do not orbit the nucleus like planets, rather they can be anywhere in a cloudlike region around the nucleus. �Electrons of the same energy are in the same energy level.
JAMES CHADWICK � 1932 �Found that the atom has a particle that was electrically neutral (neutron).
MODERN SCIENTISTS / JAMES CHADWICK Atomic Model Object used to represent theory
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