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17. What's mass? A. A measure of an element's attraction for electrons B. The force that gravity exerts upon an object C. The sum of the number of protons and neutrons in an atom D. A measure of the amount
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17. What's mass?

A. A measure of an element's attraction for electrons
B. The force that gravity exerts upon an object
C. The sum of the number of protons and neutrons in an atom
D. A measure of the amount of matter an object contains

User Steven Noyes
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Answer:

The force that gravity exerts upon an object.

User Christian Strempfer
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The answer is D
A measure of the amount of matter an object contains is mass
User Nicole Naumann
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