What is the fluid outside the axon in a resting state composed of?

The electrical potential difference across the resting plasma membrane is called the resting potential.The outer surface of the axonal membrane possesses a positive charge while its inner surface becomes negatively charged and therefore is polarisedThe fluid outside the axon in a resting state contains a low concentration of K⁺, a high concentration of Na⁺ and thus form a concentration gradient.Different types of ion channels are present on the neural membrane, which are selectively permeable to different ions. The sodium-potassium pump transports 3 Na⁺ ions outwards for 2 K⁺ ions into the cell.