Which of the following elements has the highest ionization energy? a) sodium b) calcium c) magnesium

How are elements arranged in a periodic table

Which function is performed by earths atmosphere? a. ultraviolet rays are prevented from reaching the ozone layer. b. earths temperature is raised and moderated by trapping in heat c. charged particles from the sun are prevented from reaching earth. d. magnetic charges from space are prevented from reaching earths surface.

In the following redox reaction which is the oxidizing agent and which is the reducing agent? alcl3 + na nacl + al