Answer :

The answer is A. Ne. You can separate the elements in the other three choices through chemical changes (dissociation, ionization, electrolysis, etc.), but in order to separate the components of Ne, you would need a nuclear reaction (to decompose the nucleus) or a physical change (to strip the nucleus of its electron cloud).
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Answer:

[tex]\huge \boxed{\mathrm{A. \ Ne}}[/tex]

Explanation:

Neon cannot be broken down or be decomposed by any physical or chemical methods, because it is an element. It has properties of an element nor a compound or mixture.

Neon is a chemical element with the symbol Ne and atomic number 10.

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