The basic form of matter that cannot be broken down into simpler substances by chemical means is called an element.

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Short answer

  • In school-level chemistry, the answer to
    “what is the basic form of matter which cannot be broken down any further?”
    is: an element.

Why an element?

  • An element is a pure substance made of only one kind of atom (same number of protons in each atom).
  • It cannot be decomposed into simpler substances by ordinary chemical reactions such as heating, cooling, or reacting with acids/bases.

For example, gold, oxygen, and carbon are elements.
You can’t chemically split pure gold into “simpler” substances—it stays gold.

Related ideas (that are not the answer)

  • Compound – made of two or more elements chemically combined; can be broken down into elements (e.g., water into hydrogen and oxygen).
  • Molecule – group of atoms bonded together; may be an element (O₂) or a compound (H₂O).
  • Atom – often described as the smallest particle of an element that retains its properties, but the common textbook wording of your question is specifically aiming for “element,” not “atom.”

Forum-style TL;DR

Q: What is the basic form of matter which cannot be broken down any further (in chemistry questions)?
A: An element – the simplest chemical substance that cannot be decomposed into simpler substances by chemical reactions.

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