Electronegativity and atomic radius

State 3 physical or chemical properties for the metals

State 1 physical or chemical property of one of the nonmetal groups or elements

  In your own words define Electronegativity

Which element has the highest electronegativity?

In your own words define screening effect

Which element has the biggest atomic radius?

In terms of (i) atomic size, (ii) nuclear charge and (iii) screening effect, explain why is Beryllium (Be) is more electronegative than Radium (Ra).  

In terms of (i) atomic size, (ii) nuclear charge and (iii) screening effect, explain why is Potassium (K) is Less electronegative than Arsenic (As).

Explain the difference in atomic size of the elements Carbon (C) and Lead (Pb)

Which element has a greater atomic radius Cesium (Cs) or Oxygen (O)?