Which monatomic ions would you expect radium (z = 88) and selenium (z = 34) to form?

Radium belongs to 2nd group (Magnesium family) which means it will give +2 ion.
Ra2+

Selenium belongs to Oxygen family which means it will give -2 ion.
Se2-

Heat is involved in chemical change in two ways; chemical changes either result in heat being added to or removed from an object, and chemical changes require a certain amount of heat before they can take place.