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What defines the mass number of an isotope
answered Nov 27, 2017
5 votes
17.1k views
Which scientist proposed a modification to the theory of atomic structure that established electron energy levels, or shells? a. niels bohr b. james chadwick c. ernest rutherford d. erwin schr��dinger
answered Oct 1, 2017
0 votes
196k views
Round each number to the nearest tenth. What is the best estimate for the difference of 264.72 128.49? A. 137 B. 136.3 C. 136.2 D. 130
answered Sep 29, 2017
2 votes
46.6k views
A doctor whose father works as a janitor would be an example of _____.
answered Jul 30, 2017
4 votes
218k views
What does helen learn at the well? a.she discovers what words are. b.she finally learns how to form letters
answered Mar 26, 2016
2 votes
142k views
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