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Oxygen has six electrons in its outer shell. The oxygen ion carries a charge of minus - . What is the missing number? I have a pot thats 20 cm diameter and the height is 20 cm. How do I calculate the cubic capacity? Show that, for any non-negative integer n, 3^(6n) – 2^(6n) is divisible by 35? Why sodium ion doen not react with water when sodium acetate salt dissolve in water? Is 1-Oxaspiro[2.4]heptane optically active (symmetrical)?