TCC Biology I

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  1. Organisms are compose of  ______, which is defined as anything that takes up space and ha mass.
  2. An ______ is a substance that cannot be broken down to other substances by chemical reactions.
  3. A _____ is a substance consisting of two or more different elements combined in a fix ratio.
  4. These _____ _____ an organism need to live a healthy life an reproduce.
    essential elements
  5. The number of proton, which is unique to that element, is called the _____ _____ and is written as a subscript to the left of the symbol for the element.
    atomic number
  6. Is the sum of all protons and neutrons in the nucleus of an atom.
    mass number
  7. A _____ ______ is one in which the nucleus decays spontaneously, fiving off particles and energy.
    radioactive isotope
  8. The chemical behavior of an atom depends mostly on the number of electrons in its outermost shell. We call those outer electrons _____ _____
    valence shell
  9. the outermost electron shell is the _____ _____
    valence shell
  10. The atoms either share or transfer valence electrons. These interactions usually result in atoms staying close together, held by attractions called _____ ______.
    chemical bonds
  11. A _____ _____ is the sharing of a pair of valence electros by two atoms.
    covalent bond
  12. The attraction of a particular atom for the electrons of a covalent bond is called its _______.
  13. Because of their opposite charges, cations and anions attract each other, this attraction is called an _____ _____.
    ionic bond
  14. Compounds formed by ionic bonds are called _____ _____.
    ionic compounds
Card Set:
TCC Biology I
2014-09-11 22:21:14
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