Two descriptions for a sub-atomic particle are listed below: description 1: has a noticeable relative mass description 2: located inside the nucleus of an atom which sub-atomic particle or particles fit these descriptions? electrons only protons only electrons and neutrons protons and neutrons

C) Electrons and neutrons :)

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the correct option is c.

isotopes refers to different forms of the same element with the same atomic number but different mass number as a result of difference in their neutron numbers. isotopes have different relative atomic mass but share the same chemical properties.

< > according to newton's third law of motion, forces always act in equal but opposite pairs. another way of saying this is for every action, there is an equal but opposite reaction.< >