An atom of silver has a radius of 165. pm and the average orbital speed of the electrons in it is about 1.0 x 10^8m/s.

We can’t you if you only tell us that you have to show us what the answers are

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 is c) pyrite

Fine out your self ponk