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Which of these elements has the most chemically non reactive atoms neon iron lithium bromine

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The answer is Neon. The reason Neon is least reactive of all the listed elements is because it is in a group of the periodic table called Noble gases. These are elements whose atoms have a full shell of 8 Valence (outer) electrons. Because they have a full octet they do not need any extra or any less electrons to become stable and so do not bond with other elements unless ionized.
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