A testable prediction is a(n) . hypothesis experiment exercise variable

According to my understanding A testable prediction is a(an) hypothesis because hypothesis is testable through experiments.

Explanation:

Hope it will help :)

the role of the microscope world in creating new materials .

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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~ trueboss72