Why is atomic radius not a well-defined quantity? a. the radius of a given atom is widely variable. b. units of length are not small enough. c. the boundary of an electron cloud is not distinct. d. scientists are not concerned with measuring atomic radii.

answer: e.   sour taste

explanation: acids are those substances which dissociates in water to give ions. as they dissociate to give ions, they act as electrolytes and thus are electrically conductive. acids are sour in taste. example: hcl

bases are those substances which dissociates in water to give ions or accepts ions. as they dissociate to give ions, they act as electrolytes and thus are electrically conductive. bases are bitter in taste. bases are slippery in nature.