Select the element, from Group 16, with the lowest 1st ionization energy? Select

Question

Select the element, from Group 16, with the lowest 1st ionization energy? Select the element, from group 15, with the smallest (covalent) atomic radius? Which of the alkali metals (Li, Na, K, Rb, Cs, or Fr) has the least Pauling electronegativity? Which of the group 15 elements (N, P, As, Sb, or Bi) should form the most polar bond to hydrogen, based on Pauling electronegativities? Which of the group 13 elements has the lowest density in its standard state? Which of the elements of the third period should have the highest 2nd ionization energy? For which of S, Cl, or K is the absolute value of the Electron Affinity least? Which of the ions Li^+, Na^+, K^+, Rb^+, or Cs^+ is the smallest? For the elements: X = 0, H, Br, or I, which has the largest average X-H bond energy?

Explanation / Answer

Periodic trends

Element from Group 16 with lowest Ist ionization energy,

Polonium

Element in Group 15 with smallest atomic radius,

Nitrogen

Element in alkali metal group with least paulings electronegativity,

Fr

Group 15 element to form most polar bond with hydrogen,

N

Group 13 element with lowest density,

Thalium

The element with highest 2nd ionization energy in group third would be,

scandium

The element with lowest value for elecetron affinity would be,

K

The ion smallest among the list would be,

Li+

For the elements X = O, H, Br or I. The one with the largest average X-H bond energy,

I

this being least electronegative element.

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