Biology 8th Edition by Kenneth Mason ,Jonathan Losos,Susan Singer,Peter Raven,George Johnson

تمرين 1

Which of the following is NOT a property of the elements most commonly found in living organisms
A) The elements have a low atomic mass.
B) The elements have an atomic number less than 21.
C) The elements possess eight electrons in their outer energy level.
D) The elements are lacking one or more electrons from their outer energy level.