____________ Select the element, from the fifth period, with the lowest 1st ionization energy? ______________ Which of the listed alkaline earth elements (Be, Mg, Ca, Sr, or Ba) has the largest (covalent) atomic radius? _____________ Select the element from the fourth period which has the greatest Pauling electronegativity? __________ Which of the group 16 elements should form the least polar bond to hydrogen, based on Pauling electronegativities? _________ Which of the group 14 elements has the highest density in its standard state? __________ Which of the elements of the third period should have the highest 2nd ionization energy? ______________ For which of F, Cl, or Br is the absolute value of the Electron Affinity greatest? ____________ which of the Fe atom, or the ions Fe^2+, Fe^3+ or Cr^3+ is the smallest? _____________ For the elements: X = C, F, N, or H, which has the largest average X-O bond energy? (Single bonds only.)