and .
Assuming complete decomposition of both samples,
First compound:
; of the first compound would contain
Oxygen and mercury atoms seemingly exist in the first compound at a ratio; thus the empirical formula for this compound would be where the subscript "1" is omitted.
Similarly, for the second compound
; of the first compound would contain
and therefore the empirical formula
.
It would be an physical change ; if you melt butter the butter goes from a solid to a liquid so therefore the physical state is changed.
<span>These atoms are known as valence atoms.</span>
+2, because the element has more protons than electrons now