Across
- 3. a group is a column of elements in the periodic table of the chemical elements
- 7. A chemical formula tells us the number of atoms of each element in a compound.
- 8. 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.
- 9. a product is a substance that is formed as the result of a chemical reaction
- 10. a solid material that is typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivity
- 13. The electron cloud is the region of negative charge surrounding an atomic nucleus that is associated with an atomic orbital
- 14. The law of conservation of mass states that mass is neither created nor destroyed. In a closed system, mass of reactants is equal to mass of products
- 17. an element or substance that is not a metal.
- 18. a substance that takes part in and undergoes change during a reaction.
- 19. the central and most important part of an object, movement, or group, forming the basis for its activity and growth.
Down
- 1. the basic unit of a chemical element.
- 2. a stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids
- 4. A period is the name given to a horizontal row of the periodic table.
- 5. an element whose properties are intermediate between those of metals and solid nonmetals. They are electrical semiconductors.
- 6. a valence electron is an outer shell electron that is associated with an atom, and that can participate in the formation of a chemical bond if the outer shell is not closed
- 8. 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
- 11. 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.
- 12. Any rearrangement of electrons in two atoms that generates a force, causing the atoms to be bound to each other, forming a molecule.
- 15. the total number of protons and neutrons in a nucleus
- 16. 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.