Across
- 3. any of the elements lithium, sodium, potassium, rubidium, cesium, and francium, occupying Group IA (1) of the periodic table. They are very reactive, electropositive, monovalent metals forming strongly alkaline hydroxides.
- 4. a solid material that is typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivity (e.g., iron, gold, silver, copper, and aluminum, and alloys such as brass and steel).
- 7. an element or substance that is not a metal.
- 9. a substance made by mixing other substances together.
- 12. 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.
- 13. 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).
- 14. the mass of an atom of a chemical element expressed in atomic mass units. 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.
- 16. the degree of compactness of a substance.
- 17. an atom or molecule with a net electric charge due to the loss or gain of one or more electrons.
- 19. the basic unit of a chemical unit
- 21. the rows on a periodic table
- 22. a thing that is composed of two or more separate elements; a mixture.
- 24. firm and stable in shape; not liquid or fluid.
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 group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction.
- 5. each of more than one hundred substances that cannot be chemically inter converted or broken down into simpler substances and are primary constituents of matter. Each element is distinguished by its atomic number, i.e. the number of protons in the nuclei of its atoms
- 6. 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.
- 7. the central and most important part of an object, movement, or group, forming the basis for its activity and growth.
- 8. any of the gaseous elements helium, neon, argon, krypton, xenon, and radon, occupying Group 0 (18) of the periodic table. They were long believed to be totally unreactive but compounds of xenon, krypton, and radon are now known.
- 10. the state or power of being reactive or the degree to which a thing is reactive.
- 11. anything that has mass and takes up space
- 15. a solid substance that has a conductivity between that of an insulator and that of most metals, either due to the addition of an impurity or because of temperature effects. Devices made of semiconductors, notably silicon, are essential components of most electronic circuits.
- 18. 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.
- 20. the columns on a periodic table
- 23. a substance that flows freely but is of constant volume, having a consistency like that of water or oil