Answer:
Condensation
Explanation:
During condensation the water vapor in the air converts to liquid, this forms clouds.
You can also refer to the attached image for more validation.
Answer:
Group 8A
Explanation:
This is because the elements in Group 8A is stable, what I mean is this elements have the maximum number of electrons in there last orbit so they dont need to form any compund with any other element in the periodic table.
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The mass per volume of a substance is called its density.