7.62 decameters, 7620 centimeters
Answer: combination reaction
The only list containing molecules is list #4
NaCl, N2, and H2O are all made up of more than one element, making them molecules. The other lists contain an element. Mg, He, and Fe are elements, not molecules.
Hope this helps!
3. A full octet (8 electrons) is needed to be stable. So if the atom gets 3 more atoms it will be stable.
