by- Winter Saunders

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Across
  1. 3. firm and stable in shape; not liquid or fluid.
  2. 5. a subatomic particle of about the same mass as a proton but without an electric charge, present in all atomic nuclei except those of ordinary hydrogen.
  3. 7. onsisting of a positively charged nucleus with electrons revolving around it in any of many possible circular orbits each corresponding to a distinct energy state
  4. 8. the number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table.
  5. 11. the central and most important part of an object, movement, or group, forming the basis for its activity and growth.
  6. 13. a table of the chemical elements arranged in order of atomic number, usually in rows, so that elements with similar atomic structure (and hence similar chemical properties) appear in vertical columns.
  7. 15. the basic unit of a chemical element.
  8. 16. a group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction.
  9. 19. the degree of compactness of a substance.
Down
  1. 1. a stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids.
  2. 2. a stable subatomic particle occurring in all atomic nuclei, with a positive electric charge equal in magnitude to that of an electron, but of opposite sign.
  3. 4. It is approximately equivalent to the number of protons and neutrons in the atom (the mass number) or to the average number allowing for the relative abundances of different isotopes.
  4. 6. a thing that is composed of two or more separate elements; a mixture.
  5. 9. a coherent, typically large body of matter with no definite shape.
  6. 10. the system of electrons surrounding the nucleus of an atom
  7. 12. He is best remembered for formulating the Periodic Law and creating a farsighted version of the periodic table of elements.
  8. 14. a substance or matter in a state in which it will expand freely to fill the whole of a container, having no fixed shape (unlike a solid) and no fixed volume (unlike a liquid).
  9. 17. a substance that flows freely but is of constant volume, having a consistency like that of water or oil.
  10. 18. a part or aspect of something abstract, especially one that is essential or characteristic.