atoms
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ATOMS. THE BUILDING BLOCKS OF MATTER. The Greek Model. Democritus concluded that matter could not be divided into smaller and smaller pieces forever. The smallest piece would be obtained and would be . He named this smallest piece of matter an . - PowerPoint PPT PresentationTRANSCRIPT
ATOMSATOMS
THE BUILDING BLOCKS OF THE BUILDING BLOCKS OF MATTERMATTER
The Greek ModelThe Greek Model
Democritus concluded that matter Democritus concluded that matter could not be divided into smaller and could not be divided into smaller and smaller pieces forever.smaller pieces forever.• The smallest piece would be obtained The smallest piece would be obtained
and would be and would be ..• He named this smallest piece of matter He named this smallest piece of matter
an an ..• He hypothesized that atoms were He hypothesized that atoms were _____ _____
and and made of the same material. made of the same material.
Dalton’s ModelDalton’s Model
All elements are composed of atoms.All elements are composed of atoms.
Atoms of the same element are exactly Atoms of the same element are exactly _____._____.
Atoms of different elements are _______.Atoms of different elements are _______.
Compounds are formed by joining of Compounds are formed by joining of atoms of _________ elements.atoms of _________ elements.
Thomson’s ModelThomson’s Model
The atom is made The atom is made of a puddinglike of a puddinglike positively charged positively charged material material throughout which throughout which negatively charged negatively charged (_______) electrons (_______) electrons were scattered, were scattered, like plums in a like plums in a pudding!pudding!
Rutherford’s ModelRutherford’s Model
Proposed that an Proposed that an atom is mostly atom is mostly empty space with a empty space with a dense, positively dense, positively charged charged ____________in in the center.the center.
Negatively charged Negatively charged electrons were electrons were scattered outside scattered outside nucleus.nucleus.
Bohr ModelBohr Model
Electrons move in Electrons move in definite orbits definite orbits around the around the nucleus.nucleus.
These orbits, or These orbits, or __________, are __________, are located at certain located at certain distances from the distances from the nucleus.nucleus.
Wave ModelWave Model
Electrons do not move around an Electrons do not move around an atom in a _______ path.atom in a _______ path.
Scientists can only predict where an Scientists can only predict where an electron may be.electron may be.
Location is based on how much _____ Location is based on how much _____ the electron has.the electron has.
Modern Atomic TheoryModern Atomic Theory
Based on Rutherford’s Model, Bohr’s Based on Rutherford’s Model, Bohr’s Model and wave mechanics.Model and wave mechanics.
• An atom has a small, positively charged An atom has a small, positively charged nucleus surrounded by a large region in nucleus surrounded by a large region in which there are enough electrons to which there are enough electrons to make the atom _______.make the atom _______.