Which of the following is an element?

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Prepare for the WJEC GCSE Chemistry Exam with multiple choice questions and detailed explanations. Enhance your knowledge and boost your confidence. Get exam-ready today!

Multiple Choice

Which of the following is an element?

Explanation:
An element is a substance that contains only one type of atom. Copper fits this perfectly, since it is made of copper atoms alone. Oxygen gas also qualifies as an element because it is composed solely of oxygen atoms (though they pair up as O2 molecules). Water and salt, on the other hand, are compounds because they contain two or more elements chemically bound in fixed ratios. So, both copper and oxygen gas are elements; if the answer key lists only one, it’s missing that oxygen gas is also an element.

An element is a substance that contains only one type of atom. Copper fits this perfectly, since it is made of copper atoms alone. Oxygen gas also qualifies as an element because it is composed solely of oxygen atoms (though they pair up as O2 molecules). Water and salt, on the other hand, are compounds because they contain two or more elements chemically bound in fixed ratios. So, both copper and oxygen gas are elements; if the answer key lists only one, it’s missing that oxygen gas is also an element.

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