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The mass number of an element is equal to A. the total number of electrons. B. the sum of the protons and neutrons. C. less than twice the atomic number. D. a constant number for the lighter elements.
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Asked 4/3/2014 10:57:52 AM
Updated 4/3/2014 11:47:40 AM
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User: The mass number of an element is equal to A. the total number of electrons. B. the sum of the protons and neutrons. C. less than twice the atomic number. D. a constant number for the lighter elements.

Weegy: the answer is A
kay218|Points 20|

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Asked 4/3/2014 10:57:52 AM
Updated 4/3/2014 11:47:40 AM
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The mass number of an element is equal to the sum of the protons and neutrons.
Added 4/3/2014 11:47:40 AM
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The billiard ball model was the working model of the atom until Thomson discovered the A. nucleus. B. proton. C. neutron. D. electron.
Weegy: The billiard ball model was the working model of the atom until Thomson discovered the electron. (More)
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Updated 12/23/2014 9:01:14 AM
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Using the periodic table, determine the number of neutrons in carbon. A. 12 B. 2 C. 6 D. 18
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