Sodium, iron, diamond, wood, nitrogen, oxygen, hydrogen, chlorine and sulphur are

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Elements

Atoms

Compounds

Molecules

answer is B.

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Detailed Solution

Sodium, iron, diamond, wood, nitrogen, oxygen, hydrogen, chlorine and sulphur are elements.
Element is defined as a substance that cannot be broken down into two or simpler substances. Out of 116 elements, 92 elements occurred naturally, and the remaining are prepared artificially. Examples of elements are nitrogen, chlorine, oxygen, etc. Elements are classified into three types which are known as metals, non-metals, and metalloids. Metals are good conductors of heat and electricity whereas non-metals do not conduct heat and electricity. Metalloids show intermediate to good conductance of heat and electricity. The oxides of metalloids are amphoteric or weakly acidic.

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