Is the something missing from the question
Answer:
hard and brittle
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Answer: A and D, I believe
Explanation:
Answer:
D. Increase in UV radiation
Explanation:
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A lone oxygen atom has 6 electrons in its outer shell which is not very stable, whereas as full octet (8 outer shell electrons) is stable. In order to achieve this two oxygen atoms will share 4 electrons, each contributing 2 electrons. Since these electrons exist within the orbitals of both atoms, to oxygen atoms essentially achieve a full octet.