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Which substance is an element?

Answer and explanation

Correct answer: Oxygen

Oxygen is an element because it consists of only one kind of atom. Water is a compound, as hydrogen and oxygen are chemically combined in it. Salt solution and milk are mixtures; milk is specifically a colloid. Exam tip: A substance containing only one type of atom is an element.

Related tags

ElementOxygenClassification Of MatterChemical SubstancesClass 11 ChemistryNature Of MatterSome Basic Concepts Of ChemistryChemistry

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