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Help! 1) Rank these elements according to electron affinity.Ge,Be,F. 2) Arrange these elements according to atomic radius.Se,Te,Po,O,S.? Question 2: Find the average rate of change of the function f(x)=x-4 from x=-1 to x=2.? Put he lattice energies of the following ionic compounds: CaS, CaO, CaCl2, CaF2, in increasing order? What is the molecular weight of 80.50 g of gas in a 16.17 L container at 424.6 K with a pressure of 5.42 atm? Pretell definition?