Which statement is true about ionic compounds?
they are made up of many large molecules that are bonded together.
they are made up of atoms of only one type of element.
they are made up of particles that are arranged in a repeating pattern.
they are made up of a random ratio of elements that are bonded together.

I believe that the best answer among the choices provided by the question isThey are made up of particles that are arranged in a repeating pattern.
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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