- Rank the following ions in order of decreasing radius: O2−,S2−,Se2−,Te2−, and Po2−?

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I'm having trouble balancing this equation:
CaO + SO2 + O2 -> CaSO4? Cos^2 x + 2 cos x+1= 0 Solve the equation on the interval [0, 2pi).? Which of the following is the contrapositive of a statement " if i can afford the airfare, then i will purchase a nonstop flight"? Whats the order from smallest to biggest; macromolecule, organelle, atom, cell, monomer? Evaluate the limit: lim(x->0+) of integral(x to 1) 1/sqrt(t) dt?