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science Discovering Parts of an Atom 6th grade
Terms in this set (25)
Many ancient Greek philosophers thought that all matter was made of only four elements--fire, water, air and ____.
These early scientists were not able to ____ their theories.
Democritus proposed that matter is made of small indivisible objects called ____.
He proposed that atoms of one ____ are different from atoms of other ____.
John Dalton proposed the ____ theory, which was based on careful observations and ____.
Dalton's theory states that atoms cannot be divided, ____ or destroyed.
He proposed that different types of ____ are made from different types of atoms.
An ____ is the smallest piece of an element that still represents that element.
Atoms were first seen by using a ____ microscope
cathode, positively, negative
Thompson discovered that rays in a ____ were attracted to a ____ charged plate, which means that the rays have a ____ charge.
sphere, a positive/negative charge
Thompson's atomic model stated that an atom is a positively charged ____ with ____ throughout it.
Rutherford's student performed an experiment during which they shot ____ particles into a piece of ____ foil.
The results showed that most of the particles traveled through the foil, but some bounced to the ____, and a few bounced straight back.
Rutherford's resulting atomic model proposed that most of an atom's ____ and ____ charge is concentrated in the center of the atom.
The ____ is the small, positively charged area in the center of the atom.
In the nucleus is the ___, which is an atomic particle with one positive charge.
____ was one of Rutherford's colleagues
Chadwick discovered the ____, a neutral particle that exists in the ____ of an atom.
Bohr, electrons, energy levels
The atomic model of ____ proposed that ____ move in circular orbits, or ____ around the nucleus.
When energy is added to an atom, electrons move to higher ____, when energy is released by the electron , it moves back to a lower level
The limitation of Bohr's model is that electrons do not actually move in ____ orbits.
In modern atomic theory, electrons form a ____, which is an area around the ____ in which an electron is likely to be located.
An electron cloud is mostly ____ space.
Protons and ____ are made of smaller parts called ____.
There are ____ types of quarks.
Recommended textbook explanations
Giancoli Physics: Principles With Applications
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Principles of Physics (International Edition)
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