How would the tendency to lose electrons change as we go from left to right across a period of the periodic table?

Given alongside is a part of the periodic table : As we move horizontally from left to right :

(i) What happens to the metallic character of the elements ?

(ii) What happens to the atomic size ?

How would the tendency to gain electrons change on moving from left to right in a period of the periodic table ?

How does the chemical reactivity of alkali metals vary on going down 1 of the periodic table?

How does the chemical reactivity of the halogens vary on going down in group 17 of the periodic table ?