Question

1. Using only the periodic table arrange the following elements in order of increasing ionization energy: thallium, lead, astatine, polonium
2. Using only the periodic table arrange the following elements in order of increasing ionization energy: potassium, rubidium, hydrogen, cesium

Answer 1

1. thallium<lead<polonium<astatine

2.hydrogen>potassium>rubidium>cesium.