Postal or Sorting Assistants Model Paper 3 With Solutions

(d) The heaviest element in terms of heaviest per a givennumber of atoms is the element with the highest atomic weight. This is the element with the largest number of protons, which is presently element 118, ununoctium. Unnoctium is the heaviest element, but it is man-made. The heaviest naturally-occurring element is uranium (atomic number 92, atomic weight 238.0289).