An atom of aluminum in the ground state and an atom of gallium in the ground state have the same
(1) mass
(2) electronegativity
(3) total number of protons
(4) total number of valence electrons

(4) total number of valence electrons, because they exist in the same group.

The  grandmother cell  is a hypothetical  neuronthat represents a complex but specific concept or object.[1]  it activates when a person "sees, hears, or otherwise sensibly discriminates"[2]  a specific entity, such as his or her grandmother. the term was in use at least as early as 1966 amongst staff and students in the department of experimental psychology, university of cambridge, england. a similar concept, that of the  gnostic neuron, was proposed two years later

The answer for this question is d. none of these