If the crystal pattern for halite expanded in every direction, how many chloride ions would surround each sodium ion

The electromagnetic force acts between what

The diagram shows the structures of horse and cat forelimbs. what does the diagram suggest about the evolutionary relationship between these two mammals? a. they have homologous structures, indicating a common ancestor. b. they have analogous structures, indicating a common ancestor. c. they have homologous structures, indicating that they do not have a common ancestor. d. they have analogous structures, indicating that they do not have a common ancestor.

For ai it's atomic number is 13 and it's mass number is 27 how many neutrons does it have