Which element’s atoms have the greatest average number of neutrons?

Which best describes why nh4+ can form an ionic bond with cl-?

Harry lives in a city, and he has a lung condition known as asthma. on certain days, harry has to stay inside because pollutants in the air make it difficult for him to breathe. which of these pollution sources are nonpoint sources that might bother harry if he goes outside? choose the two that apply.

Nuclear decay is the spontaneous decay of one element into a. an x-ray b. a ray of light c. another element