What is an element?

What is an element?

• A. A substance that cannot be broken down into simpler substances
• B. A substance that can be easily broken down into simpler substances
• C. A mixture of compounds
• D. A type of energy

Answer: (A)

An element is a pure substance made of only one kind of atom, and it cannot be broken down into simpler substances by ordinary chemical reactions. This makes it the basic building block of matter; elements come together to form compounds and, in mixtures, substances are combined without chemical bonds. If something can be broken down into simpler substances, it isn’t an element—it's either a compound (two or more elements bonded together in fixed proportions) or a mixture (a physical blend of substances that can be separated). A type of energy isn’t a substance at all. So the defining idea is that an element cannot be decomposed into simpler substances through typical chemical means.

An element is a pure substance made of only one kind of atom, and it cannot be broken down into simpler substances by ordinary chemical reactions. This makes it the basic building block of matter; elements come together to form compounds and, in mixtures, substances are combined without chemical bonds. If something can be broken down into simpler substances, it isn’t an element—it's either a compound (two or more elements bonded together in fixed proportions) or a mixture (a physical blend of substances that can be separated). A type of energy isn’t a substance at all. So the defining idea is that an element cannot be decomposed into simpler substances through typical chemical means.