Negatively Charged Ions Are Required to Balance the Net Positive

Multiple Choice

Negatively charged ions are required to balance the net positive charge from metal ions such as K⁺, Na⁺, and Ca²⁺.Which of the following negatively charged ions is the most abundant outside the cell and which ion most often neutralize (written in parentheses) ?

A) Cl⁻ (Ca²⁺)
B) PO₄³⁻ (K⁺)
C) PO₄³⁻ (Ca²⁺)
D) Cl⁻ (Na⁺)