Across
- 3. firm and stable in shape; not liquid or fluid.
- 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.
- 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
- 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.
- 11. the central and most important part of an object, movement, or group, forming the basis for its activity and growth.
- 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.
- 15. the basic unit of a chemical element.
- 16. a group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction.
- 19. the degree of compactness of a substance.
Down
- 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. 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.
- 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.
- 6. a thing that is composed of two or more separate elements; a mixture.
- 9. a coherent, typically large body of matter with no definite shape.
- 10. the system of electrons surrounding the nucleus of an atom
- 12. He is best remembered for formulating the Periodic Law and creating a farsighted version of the periodic table of elements.
- 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).
- 17. a substance that flows freely but is of constant volume, having a consistency like that of water or oil.
- 18. a part or aspect of something abstract, especially one that is essential or characteristic.