- If Oxygen has 6 valence electrons, why is it's charge -2?

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Prove that every bounded sequence of real numbers which does not converge has two subsequences converging to different limits.? Is the star of david in nature basically FRICTION. like a high surface area of carbon, or when water vapor turns into ice...? Why is the atomic radii of strontium larger than beryllium? What is agricultural labour? If sin α=3/5, sinβ=5/13, a is in quadrant 1 and β is in quadrant 2, find sin(α+β).?

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