An uncharged atom of mercury has an atomic number of 80 and an atomic mass of 200. This atom has ________ protons, ________ neutrons, and ________ electrons.
A. 80; 120; 80
B. 120; 80; 120
C. 120; 280; 120
D. 80; 40; 80
Answer:A
An uncharged atom of mercury has an atomic number of 80 and an atomic mass of 200. This atom has ________ protons, ________ neutrons, and ________ electrons.
A. 80; 120; 80 B. 120; 80; 120 C. 120; 280; 120 D. 80; 40; 80