Lithium Ion Batteries Are High Energy Density 3

Lithium ion batteries are high energy density 3.6 V batteries that use a
Lithium salt such as LiCoO₂ or LiPF₆ for the positive electrode, or cathode. Use the positions of lithium and fluorine in the periodic table to predict the oxidation state of the phosphorus atom in LiPF₆.

A) +1
B) +2
C) +3
D) +4
E) +5