Which element is classified as a noble gas?
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An atomic nucleus is composed ofa)protons.b)protons and neutrons.c)protons and electrons.d)protons, neutrons, and electrons.

The empirical formula of a compound is ch2o and its mass is 120 amu/molecule, what is its formula?

The velocity of any object depends upon a) the location of the object. b) the location of the observer. c) which measurement tools are used. d) the relative motion of the observer.