Question 4: C
question 5: D
Hello! My name is Zalgo and I am here to help you out today. The most common form of matter in the universe would be "Plasma". Plasma is gas that is heated a lot so it turns into high energy (high energy would be said "Plasma").
I hope that this helps! :D
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The answer is D. To put it simply, all atom wished to become stable. The only way for that is to obtain an octet structure where the outermost shell would have 8 electrons, thus being full.