A chemical reaction must occur for a compound to have different properties.
Both carbon and lead belong to Group IV elements, and thus they have the same number of valence electrons.
<span>In
each of the other options, the two elements belong to different groups,
and thus they do NOT have the same number of valence electrons.
I hope this helped you, please tell me if I am correct or not <3
</span>
2) generating power by using fossil fuels is harvesting a non-renewable resource. The more you harvest = the less you have
1/5 + 1/4 =1/x
4x + 5x = 20
9x = 20
x = 2.22 hours Answer
CFC-11 is typically the CFC with the shortest atmospheric lifetime.
