The Diagram that shows the correct position is : Diagram 4
The neutrons in a Lithium atom is located in the nucleus of the atom and the protons which are positively charged ion are located along the outer shell closest to the nucleus while the Electrons ( negatively charged ) are located along the outermost shell of the Lithium atom.
The electron configuration Lithium atom is expressed as ; 2s¹
Hence the diagram that shows the correct position of neutrons, protons and electrons is Diagram 4.
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