They are very stable (not reactive).
This is because their outer shell has a total of 8 valence electrons. All elements strive to get towards a full outer shell, but since these elements already have a full outer shell, they are fairly unreactive.
Answer:
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Answer:
Arrow A:
✔ 74.6 kJ
Arrow B:
✔ exothermic
Arrow C:
✔ has a magnitude that is less than that of B
Arrow D:
✔ represents the overall enthalpy of reaction
Explanation:
The answer here is B: Helium.
As many stars, the sun is largely composed of hydrogen and helium. The sun is able to give off radiant energy through the nuclear fusion process. This involves the process by which hydrogen isotopes fuses to create one helium atom and then creates radiant energy that travels to Earth.
