Chem Vocab 1

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Across
  1. 2. the temperature at which a solid melts
  2. 4. Rules for which digits are significant
  3. 8. When the outer electrons are repelled by the cone electrons so the nucleus' effective change on the outermost electrons is decreased
  4. 15. The release of energy from the decay of the nuclei
  5. 16. The mass of an atom of a chemical element expressed in atomic mass units
  6. 18. Any change that causes a new substance to be formed; changes chemical composition
  7. 21. Mass of a unit volume of a material substance
  8. 23. An electron at a higher energy state than it's energy state
  9. 24. The number of protons in the nucleus
  10. 25. The lowest energy state of an electron
  11. 26. A way of expressing numbers that are too large or too small to be written in decimal form
  12. 27. The displacement of a wave from zero
Down
  1. 1. A thought out explanation of the natural world
  2. 3. A diagram representing the limits of stability
  3. 5. When a substance undergoes a change that does not change their chemical composition
  4. 6. Branch of science that studies the identification of the substance that make up matter
  5. 7. Chemical property that measures how likely an atom is to attract a shared pair of electrons towards itself in a covalent bond
  6. 9. Energy released as high speed charged particles
  7. 10. The time taken for the radioactivity of a specified isotope to fall to half of it's original value
  8. 11. The temperature at which a liquid boils
  9. 12. The basic unit of a chemical element
  10. 13. The measure of the amount of matter in an object
  11. 14. The quantity of energy that an isolated gaseous atoms in ground state must absorb to discharge an electrons caseous
  12. 17. Spectrum of frequencies of electromagnetic radiation emitted due to an atom or molecule transitioning from a high energy state to a low energy state
  13. 19. The measurement of the numbers of times that a repeated event occurs per unit of time
  14. 20. The distance between two consecutive identical points on the waveform
  15. 22. A statement that describes an observable occurrence in nature that is always true