Which is an intensive property of a substance

An intensive property is a physical quantity whose value does not depend on the amount of the substance  for which it is measured.

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the answer to your question is c.

if you read the house of usher you should know that the house was haunted

answer:

the answer is 6 valence electrons.

explanation:

valence is the # of electrons on the outer most shell of an atom.

oxygen has 6.

although, the valency of oxygen is 2, because it only needs to make 2 covalent bonds, or gain 2 electrons, to achieve the stable octet configuration of a noble gas.

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