Identify the charges of each element when they form ions

a. N

b. Ca

c. K 

d. Cl

Using the atomic numbers given below, write the symbol (including the charge) of the simple cation/anion that each of the elements can most readily form.

A) 31 B) 16 C) 35 D) 19 E) 12

Although polonium is observed to have a higher ionization energy than bismuth, it is observed to have a lower ionization energy than tellurium. Explain.

Which of the following statements is correct? 

Arrange the following elements in ascending order of first ionization energies:

S, Ne, Sn, Na

Why do noble gases generally have low or zero electron affinities?

Which element is an exception to the general electron affinity trend and why?

What are the periodic table group number and a representative element for X in the ionic compound X₃(AsO₃)₂?

Which of the following pairs of elements can form ionic compounds?

A. sulfur and chlorine

B. cesium and bromine

C. bromine and sodium

D. barium and oxygen

E. sodium and calcium

F. nickel and fluorine

Lead(II) and lead(IV) ions are the two ions of lead. Provide the symbol for lead(II) ion.