While explaining cellular membrane potentials, the instructor states that during an action potential, the cell membrane becomes more permeable to which mineral/electrolyte?

during action potential the cell membrane becomes more permeable to sodium ions to depolarized the cell to pass the nerves

Explanation: During resting potential the cell membrane contain more potassium ions inside of the cell then outuside to keep the cell negatives internally and this job has been doing by sodium -potassium  pump which push two k+ ions inside of the cell & pulled 3 Na+ ions outside of the cell and thus maintain resting membrane potential but when neurotransmitter attached to the channels and tells it to open.So, they activate the m  sodium gate which usually  closed at resting membrane potential and start the movement of more sodium ions to inside of the cell to depolarize the it.

sodium i think the chemical element of atomic number 11, a soft silver-white reactive metal of the alkali metal group.