3rd one:
it is very reactive because it does not have a full Valence shell.
this is because it's in group 1 so it has one electron in its outer shell, and it wants to have a full outer shell ( which it can gain by losing the electron in a reaction).
Hope this helps :)
Answer:
It is important to identify it because the two types of crust are made up of two different types of rock
Explanation:
Hope i helped you
0.00011811023622 <span>i</span><span>nches</span>
