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The correct option is C Helium
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The term noble means that a substance is chemically non-reactive. Noble gases are considered to be inert as they have completely filled valence shell. Helium, neon, argon, etc., are the noble gases that are present in group 18 of the periodic table.
<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> The term noble means that a substance is chemically non-reactive. Noble gases are considered to be inert as they have completely filled valence shell. Helium, neon, argon, etc., are the noble gases that are present in group 18 of the periodic table.
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