Across
- 2. the smallest unit of ordinary matter that forms a chemical element.
- 3. element whose properties are intermediate between those of metals and solid nonmetals or semiconductors.
- 5. ionized gas consisting of positive ions and free electrons in proportions resulting in more or less no overall electric charge, typically at low pressures or at very high temperatures.
- 7. period in the periodic table is a row of chemical elements.
- 9. 32°F
- 11. 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.
- 12. degree or intensity of heat present in a substance or object, especially as expressed according to a comparative scale and shown by a thermometer or perceived by touch.
- 13. of two or more species of atoms of a chemical element with the same atomic number and position in the periodic table and nearly identical chemical behaviour but with different atomic masses and physical properties.
- 14. element or substance that is not a metal.
- 17. positively charged central core of an atom, consisting of protons and neutrons and containing nearly all its mass.
- 19. element or compound is a phase transition from the liquid phase to vapor.
- 22. mass of an atom of a chemical element expressed in atomic mass units.
- 23. is a chemical process where a solid turns into a gas without going through a liquid stage.
- 24. an experiment or study that does not receive treatment by the researchers and is then used as a benchmark to measure how the other tested subjects do.
- 25. to several distinct physical concepts, such as the internal energy of a system.
Down
- 1. one of the three main states of matter, along with liquid and gas.
- 3. solid material that is typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivity.
- 4. liquefied by heat.
- 6. of matter is an intermediate phase between solid and gas.
- 8. stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids.
- 10. 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.
- 11. a tabular array of the chemical elements organized by atomic number, from the element with the lowest atomic number, hydrogen, to the element with the highest atomic number, oganesson.
- 15. system of electrons surrounding the nucleus of an atom.
- 16. number of a chemical element in the periodic system, whereby the elements are arranged in order of increasing number of protons in the nucleus.
- 18. total number of protons and neutrons in a nucleus.
- 20. the process by which water vapor in the air is changed into liquid water.
- 21. substance or matter in a state in which it will expand freely to fill the whole of a container, having no fixed shape and no fixed volume