Which atom on the table had an atomic number of 7?

D.Z

Explanation:

I think

option a is correct i.e.

explanation:

in context to the membrane of nerve impulse, the outer membrane of neuron is semi permeable that is only sodium ions can pass through the membrane i.e. smaller ions can pass through the membrane while larger ions cannot pass through it.

i do not know and i have a 100 in this class