For the distribution in the following graph, what is the value of ΣX? 
Definitions:
Ionic
Relating to ions; typically describes chemical bonds formed between atoms when electrons are transferred, resulting in charged particles.
Metallic
Pertaining to elements that exhibit metallic properties, including luster, conductivity, and malleability.
Intermolecular
Pertaining to the forces or interactions that occur between molecules, affecting their physical properties and behaviors.
Electron Shells
Levels or orbits around the nucleus of an atom where electrons are likely to be found.
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