According to boyle, pressure and volume of a confined gas are proportional, and according to charles, the volume of a gas at constant pressure is proportional to its kelvin temperature.

Inversely, directly

Explanation: 1) Boyle's Law: The law states that pressure is inversely proportional to the volume of the gas at constant temperature and number of moles.

    (At constant temperature and number of moles)

2) Charles' Law: The law states that volume is directly proportional to the temperature of the gas in Kelvin at constant pressure and number of moles.

          (At constant pressure and number of moles)

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.

that's it!

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