the matter

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  1. 1. number.The sum of the protons and the neutrons in an atom’s nucleus is its mass number.
  2. 7. number The number of protons in an atom’s nucleus is its atomic number.
  3. 9. An element is a substance that cannot be broken down into simpler substances by physical or chemical means.
  4. 10. is a tiny particle that has mass and a positive electric charge.
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  1. 2. the smallest particle of an element that retains all the properties of that element
  2. 3. number of protons in an atom’s nucleus is its atomic number.
  3. 4. has little mass, but it has a negative electric charge that is exactly the same magnitude as the positive charge of a proton.
  4. 5. is anything that has volume and mass.
  5. 6. is a tiny particle with approximately the same mass as a proton, but it has no electrical charg
  6. 8. an electricly charged piece on matter that ryhmemes element bacic buliling