Part A. Match each diagram to the atom or ion it represents.
Drag each item to the appropriate bin.
An atom is made up of a positively-charged nucleus surrounded by negatively-charged electrons. The atom is neutral when there are equal numbers of protons and electrons. Ions are formed when there are unequal numbers of protons and electrons in an atom. A positive ion is called a cation whereas a negative ion is called an anion.
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