1-5-1. Which of the these elements is paired with its correct symbol?
A. magnesium, Mn,
B. potassium, Po,
C. fluorine, F,
D. argon, Ar
1-5-2. Which of the these symbols is paired with its correct name?
A. P, phosphate
B. Si, silver
C. Hg, hydrogen
D. Pb, lead
