Chapter 2 UTA

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  1. Anything that takes up space and has mass
  2. Substance that cannot be broken down to other substances
  3. How many recognized elements are there?
  4. Substance containing a fixed ratio of 2 or more different elements
  5. How many essential elements are there
    • 4
    • Carbon
    • Oxygen
    • Hydrogen
    • Nitrogen
  6. Elements only required in minute quantities such as Iron(Fe)
    Trace elements
  7. Neutrally charged subatomic particle located in the nucleus. Weighs about 1 Dalton
  8. Positively charged subatomic particle located in the nucleus. Weighs about 1 dalton
  9. Negatively charged subatomic particle weighing much less than neutrons and protons.
  10. Number of protons in an element. Written to the left of the element symbol
    Atomic number
  11. Sum of protons and neutrons in an element.
    • Mass number
    • Subtract the atomic number from the mass number to equal the number of neutrons.
  12. variation of an element. The only difference is the mass which is changed by an increase in neutrons.
  13. An unstable isotope in which the nucleus decays spontaneously, giving of
    particles and energy. The result is transformation from one type of
    atom to an atom of a different element.
    Radioactive isotope
  14. the capacity to cause change
  15. energy that matter possesses because of its location or structure
    Potential energy
  16. different states of potential energy that electrons have within an atom
    energy levels
  17. An electrons energy level based on how far away it is from the nucelus
    electron shells
  18. Electrons located in the outer shell of an atom
    valence electrons
  19. the outermost shell of electrons
    valence shell
  20. Which 3 elements are unreactive?
    Helium, Neon, Argon
  21. an attraction between electrons on incomplete valence shells of 2 different atoms.
    Chemical bonds
  22. the sharing of a pair of valence electrons by 2 atoms forming a molecule
    Covalent bond
  23. 2 or more atoms held together by covalent bonds
  24. single bond
    Shared bond
  25. one dash line linking together 2 atoms
    • Structural formula
    • H-H
  26. the number of unpaired electrons in the atoms valence shell
  27. attraction of a particular kind of atom to one another.
    • electronegativity
    • the stronger the electronegativity the stronger it pulls shared electrons toward itself
  28. a covalent bond between the same element
    non polar covalent bond
  29. when electrons are bonded with different elements.
    Polar covalent bond. One atom will be more electronegative.
  30. when two atoms have a major difference in electronegativity that the stronger atom pulls the electron away from the weaker atom
    ionic bond
  31. a charged atom or molecule due to ionic bonds.
  32. a positively charged ion.
    • cation.
    • when Na is bonded with Cl.
  33. negatively charged ion
    • Anion.
    • Cl when it bonds with Na
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Chapter 2 UTA

Chapter 2 UTA biology
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