Acylinder at left with balls evenly spaced throughout the cylinder has an arrow leading to a cylinder at right cylinder with balls stacked near its bottom.
how is energy related to the change of state represented by the model?

atoms gain energy as a gas changes to a solid.
atoms gain energy as a gas changes to a liquid.
atoms lose energy as a gas changes to a solid.
atoms lose energy as a gas changes to a liquid.

answer:

the answer is c

explanation:

as a certain gas is changing its state into that of a solid material, its atoms are going to lose some energy.

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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