Answer:
the correct answer is option ( B ) rocks cannot change their volume ,shape, and size
because a solid substance cannot change its, volume, shape and size
Hope it helps you
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Vandium is non metal but group 5 period 4
RMM of CaH2=20+(1x2)=22
Number of moles or formula units
=mass/RMM
=8.294/22
=0.377
It would be 6 because of the elements
