K. Pottasium is in period 4 and group 1. It would be classified as an Alkali metal, and its a metal!
A.
There are a lot of molecules in H2O.<span />
The answers are the following:
1. <span>1.4 x 10^11 kJ/mol
2. </span><span>9.0 × 10^6 kJ
Therefor I conclude that your answers are correct. </span>