Conductivity, malleability, and high melting points. Hope this helps :)
Non-metal elements are Noble gases,Halogens,nonmetals,semimetals(metalloids). ( and maybe other metals)
Answer:
a. 1,500 kJ
b. 
Explanation:
Hello,
In the attached picture you will find the solution for the exercise.
- Take into account that ΔT=0.
Best regards.