Sodium and potassium ions can diffuse across the plasma membranes of all cells because of the presence of what type of channel?

Due to the presence of ion channels.

Explanation:

Ion channels are formed in sell membranes by specific peptides and contron the concentration of different ions in cells.

the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.

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