Consider the following sets. In which set do all species have the same number of electrons? o K*, Rb*, Cs* O Ge, Se2-, Br- O Br, Br*, Br- O F-, Ne, Mg2+

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Atoms and Molecules

An atom is the smallest unit of an element that possesses all the properties of that particular element. Molecules are the smallest unit of a substance that possess all the properties of that particular substance.