Respuesta :

HI Mabel,

Calcium Characteristics:

  1. Calcium is reactive
  2. Calciums is a soft metal
  3. Calcium creates a mixture of oxide and nitride which creates a coating to prevent itself from corrosion.

Radium Characteristics:

  1. Radium is silvery
  2. Radium is intensely radioactive
  3. Radium is luminescent

Hope This Helps!