Which of the compounds below have bonds that are predominantly ionic KCL or CH3 or CH4 orNH3

KCL

As we know Ionic bond is formed between almost different Electronegativity.Potassium lies in 1st group hence it has lowest electronegativity.Chlorine lies in 17th group of halogen hence it has highest Electrinegativity

Option A is correct

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