Please help me answer this!!

As you move from right to left on the periodic table the atomic radius fill in the blank

Consider the four elements above. which one of these elements will combine with oxygen in a 1: 1 ratio?

In a ni-cd battery, a fully charged cell is composed of nickelic hydroxide. nickel is an element that has multiple oxidation states. assume the following proportions of the states: nickel charge proportions found 0 0.17 +2 0.3 +3 0.33 +4 0.5 (a) determine the mean of the nickel charge. enter the answer to 2 decimal places.(b) determine the cumulative distribution function of nickel charge.