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The modern atomic model states that electrons move sort of like A. a swarm of bees around a bee hive. B. really fast runners going around a track. C. lots of people jammed up and moving
around on a dance floor. D. football players all moving in on the ball carrier to make a tackle.
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Asked 5/2/2011 7:23:24 AM
Updated 5/2/2011 7:42:36 AM
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A. a swarm of bees around a bee hiveIn atomic physics
Atomic physics
Atomic physics is the field of physics that studies atoms as an isolated system of electrons and an atomic nucleus. It is primarily concerned with the arrangement of electrons around the nucleus and...

, the Bohr model, devised by Niels Bohr
Niels Bohr
Niels Henrik David Bohr was a Danish physicist who made fundamental contributions to understanding atomic structure and quantum mechanics, for which he received the Nobel Prize in Physics in 1922. Bohr mentored and collaborated with many of the top physicists of the century at his institute in...

, depicts the atom
Atom
The atom is a basic unit of matter that consists of a dense, central nucleus surrounded by a cloud of negatively charged electrons. The atomic nucleus contains a mix of positively charged protons and electrically neutral neutrons...

as a small, positively charged nucleus
Atomic nucleus
The nucleus is the very dense region consisting of nucleons at the center of an atom. Almost all of the mass in an atom is made up from the protons and neutrons in the nucleus, with a very small contribution from the orbiting electrons...

surrounded by electron
Electron
The electron is a subatomic particle carrying a negative electric charge. It has no known components or substructure. Therefore the electron is generally-believed to be an elementary particle. An electron has a mass that is approximately 1/1836 that of the proton...

s that travel in circular orbits around the nucleus—similar in structure to the solar system
Solar System
The Solar System consists of the Sun and the astronomical objects bound to it by gravity, all of which are understood to have formed from the collapse of a giant molecular cloud approximately 4.6 billion years ago...

, but with electrostatic forces providing attraction, rather than gravity. This was an improvement on the earlier cubic model (1902), the plum-pudding model (1904), the Saturnian model (1904), and the Rutherford model
Rutherford model
The Rutherford model or planetary model is a model of the atom devised by Ernest Rutherford. Rutherford directed the famous Geiger-Marsden experiment in 1909, which suggested on Rutherford's 1911 analysis that the so-called "plum pudding model" of J. J. Thomson of the atom was incorrect...

(1911).
Added 5/2/2011 7:42:36 AM
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An example of a substance with a definite volume and a definite shape is a steel beam.
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This answer has been confirmed as correct, not copied, and helpful.
Confirmed by Andrew. [12/8/2015 11:59:36 PM]
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A. chemical bond
Added 6/18/2012 10:16:06 AM
This answer has been flagged as incorrect.
Rated good by danimai, Flagged by Janet17 [12/28/2014 12:03:13 PM]
The specific temperature at which a substance changes from a liquid to a gas is an example of a physical property.
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