Structure of Matter

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Across
  1. 2. A substance made up of only one kind of atoms that cannot be broken down into simpler substances by chemical methods.
  2. 4. The atoms of many elements cannot exist independently in nature and called _______ elements.
  3. 8. The smallest particle of an element or a compound that can exist independently.
  4. 9. The number of atoms present in a molecule of an element.
  5. 10. The smallest particle of an element that can take part in a chemical reaction.
  6. 11. The combining capacity of an element to attain stability.
  7. 12. These are used to represent elements.
Down
  1. 1. These are used to represent compounds.
  2. 3. Certain elements show more than one valency, they exhibit _______ valency.
  3. 5. The atoms of some elements can exist independently and called ________ elements.
  4. 6. A substance formed by the chemical combination of two or more elements in fixed proportions.
  5. 7. The elements or compounds that take part in a chemical reaction are called the _______.