**URGENTTwo atoms that are isotopes of one another must have the same number of what? * Electrons and neutrons
Protons and neutrons
Protons and electrons
Protons
Electrons
Neutrons

protons and neutrons

is the answer

Neutrons.

Explanation:

Two atoms which are isotopes of one another must have a different number of neutrons.

Isotopes are defined as atoms of the same element which have the same numbers of protons i.e. atomic number remains the same but has different numbers of neutrons. It is observed that they have the same chemical properties due to the same electronic configuration but physical properties differ.

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answer; both surfaces of the membrane are nonpermeable