period 3
chemistry
Written & reviewed by James Millett — Biology (Imperial College London), PGCE Science (University of Cambridge).
Period 3: the third row of the periodic table, containing elements from Na (Z=11) to Ar (Z=18).
chemistry
Written & reviewed by James Millett — Biology (Imperial College London), PGCE Science (University of Cambridge).
Period 3: the third row of the periodic table, containing elements from Na (Z=11) to Ar (Z=18).