Marta wants to explain how pollution is affecting the biodiversity of a local lake. Which of the following models are most appropriate options to use in her explanation? I. Graph II. 3-D model III. Simulation

it's c. elements are placed in rows based on how may valencies electrons have.

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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