8th grade Sarah reddish

12345678910111213141516171819202122232425
Across
  1. 3. he 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.
  2. 5. The process in which a solid transforms into a gas phase without first melting to form a liquid phase.
  3. 8. each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei, and hence differ in relative atomic mass but not in chemical properties; in particular, a radioactive form of an element.
  4. 11. the integer nearest in value to the atomic weight of an atom and equal to the number of nucleons in the nucleus of the atom. Symbol: A.
  5. 13. noun. a table of the elements, arranged in order of increasing atomic number, based on the periodic law. Elements having similar chemical properties and electronic structures appear in vertical columns (groups)
  6. 15. is a phase transition where a liquid turns into a solid when its temperature is lowered below its freezing point.
  7. 16. is a nearly incompressible fluid that conforms to the shape of its container but retains a (nearly) constant volume independent of pressure
  8. 17. period in the periodic table is a row of chemical elements. All elements in a row have the same number of electron shells. Each next element in a period has one more proton and is less metallic than its predecessor.
  9. 18. are the basic units of matter and the defining structure of elements.
  10. 20. stable subatomic particle that has a positive charge equal in magnitude to a unit of electron charge
  11. 21. proton or neutron.
  12. 24. process by which water vapor in the air is changed into liquid water
  13. 25. an imprecise term used to describe a chemical element that forms a simple substance having properties intermediate between those of a typical metal and a typical nonmetal.
Down
  1. 1. 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.
  2. 2. conversion of a substance from the liquid or solid phase into the gaseous (vapour) phase.
  3. 4. change of a solid into a liquid when heat is applied
  4. 6. relating to the mind, its activity, or its products as an object of study : ideological mental science. f : relating to spirit or idea as opposed to matter the distinction between physical things and mental ideas
  5. 7. A measure of the ability of a substance, or more generally of any physical system, to transfer heat energy to another physical system
  6. 9. contained within a system that is responsible for its temperature.
  7. 10. is a state of matter that has no fixed shape and no fixed volume
  8. 12. firm and stable in shape; not liquid or fluid
  9. 14. the system of electrons surrounding the nucleus of an atom
  10. 19. state of matter in which an ionized gaseous substance becomes highly electrically conductive to the point that long-range electric and magnetic fields dominate the behaviour of the matter.
  11. 22. nonmetal (or non-metal) is a chemical element that mostly lacks the characteristics of a metal.
  12. 23. a number of people or things that are located close together or are considered or classed together.