Which two types of particles are present in equal numbers in an atom, but not in an ion? a. protons and electrons b. protons and neutrons c. inner-shell electrons and outer-shell electrons d. protons and inner-shell electrons

An atom consists of a central nucleus with contains positively charged particles called protons and uncharged particles called neutrons. Negatively charged particles called electrons revolve around the central nucleus along specific orbitals. In a neutral atom, the number of positive protons and negative electrons is same. A metal atom has the tendency to lose electrons from its outermost electronic shell (orbital) to form a positive ion (cation). As a result, the number of electrons decreases. On the other hand, a non-metal atom has the tendency to gain electrons to form a negative ion (anion). As a result, the number of electrons increases. Therefore, electrons and protons are the two types of particles that are present in equal numbers in an atom but not in an ion.

(Answer) (A) protons and electrons

an adaptation is a change or process by which an organism takes to be better suited for its environment. for example; migration is a behavioral adaptation, this is needed because birds are not built to last extremely cold climates. there are different adaptations because there are different species needing to adjust to different things, bears don't migrate; they hibernate.