1. What is matter?
    matter is defined as anything that takes up space and has mass. Matter can exist in many forms, rocks, humans, metals, oils and more.
  2. What is matter made of?
    matter is made out of elements.
  3. What is an element?
    An element is a substance that that connot be broken down to other substances by chemical reactions.
  4. What is a compound? What are some examples of compounds?
    A compound is a substance that consist of two or more different  elements combined. An example would be NaCl or table salt.
  5. Out of 92 elements only 20-25% are_______ _______ that an organsim needs to live a healthy life and reproduce.
    essential elements
  6. What are the four elements that up 96% of living matter?
    Oxygen, Carbon, Hydrogen, Nitrogen
  7. What is an atom? What are they composed of?
    an atom is the smallest unit of matter that retains the properties of an element. Although they are the smalles an atom is composed of smaller parts  called subatomic particles. Neutrons, Protons, and Electrons
  8. What is electrically charged and has one unit of positive charge?
  9. What is electically charged and has one unit of negative charge?
  10. What is electrically neutral in an atom?
  11. What is atomic nucleus? What does it contain?
    The atomic nucleus is the center of the atom, here protons and neutrons are packed togethere tightly.
  12. What is unique of an element and is contained in its nuclei?
  13. Atoms of the same element who have more neutrons are called?
  14. What is a radioactive isotope?
    a radioactive isotope is when  the nucleus decasy spontanneously, giving out particle and energy. When the decay leads to a change in number of protons it changes the element.
  15. There is a small amunt of naturally accurring ______________. They can be used to trace metabolic process in living things because the body recognizes the element and still uses it.
  16. what are used to locate cancer using PET scan and use for dating fossils
  17. What is potentically harmful because they give off radioctivity which can damage cells; nuclear accidents produce the most danger.
  18. Electrons are organized into energy leels or
  19. Electrons further from nucleus have higher
    amounts of energy
  20. Each shell can hold a maximum number of electrons
    1st Shell___ electrons
    2nd Shell____ electrons
    3rd Shell ____electrons
  21. Can give energy and move up to next level: needs extra input of energy
  22. The number of electrons in the _____________________ affects the reactivity of the atom
    outer shell
  23. Electrons in _____________________; most reactive
    outer most shell
  24. They determine how many bonds of atoms can form
  25. Atoms interact by bonding. Goal is to
    completly fill the outside electron shell.
  26. When do chemical bonds occur?
    when atoms satisfy their need for electrons by gaining, losing, or sharing electons with one another.
  27. what are Covalent bonds?
    electrons are shared by atoms
  28. A molecule is formed when?
    more than one atom is bonded together.
  29. a compound  is ______________________________________________
    two or more different kinds of atoms bonded together.
  30. Molecules can be the _______ kinds of atoms.
    same or different
  31. The following examples can be described as
    • C: element
    • H2: molecule
    • CH4: molecule/ compound
  32. What are Polar Covalent Bonds
    the way electrons are shared is not equal.
  33. Ionic bonds __________ electrons from one atom to another atom.
  34. Cations has______ charge
  35. Anions has a __________ negative charge
  36. Ions held together by attration of _____________ produces _______ structures
    opposite charge, crystalline
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