Chapter 5 glossary terms

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Chapter 5 glossary terms
2014-05-12 18:24:37
chpt5 glossary glossaryterms textbook homework chemistry
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Chapter 5 glossary terms homework
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  1. Atom
    The smallest particle of an element that retains the identity of the element.
  2. Electron
    • - The first subatomic particles to be discovered
    • - Very small mass
    • - Negatively charged particle
  3. Subatomic particle
    particles that make up an atom.
  4. Nucleus
    The centre of the atom
  5. Proton
    • - Positively charged particle
    • - Relative mass of 1836
    • - Located inside the nucleus
    • - Determines what an atom is
  6. Neutron
    • - Neutral particles
    • - Located inside the nucleus
  7. Energy levels
    Fixed regions around the nucleus. For an electron to move from one electron to a higher one it must absorb a specific amount of energy called a quantum.
  8. Atomic number
    The # of P+ in the nucleus and the # of e- in a neutral atom.
  9. Mass number
    The number of protons + the number of neutrons
  10. Isotope
    Atoms of an element that have the same number of protons but a different number of neutrons

    • - Each isotope has a unique mass # so they specify each isotope by placing it's mass # after the name of the element
    • ex. C-12, C-14
  11. Bohr-Rutherford diagram
    Used to show the arrangement of subatomic particles for an element

    • Potassium:
  12. Atomic mass
    the mass of an atomic particle

  13. Periodic table
    The table of elements
  14. Metal
    Solids at room temperature, shiny, good conductors, malleable, and ductile
  15. Non-metal
    do not possess lustre, poor conductors of heat and electricity, neither malleable or ductile, are gasses at room temperature, can be solid,gas, or liquid.
  16. Metalloids
    have some properties of metals and some of non-metals.
  17. Period
    A horizontal row of elements in the periodic table.
  18. Group
    A vertical column of elements in the periodic table.
  19. Alkali metal
    • The elements in group one except hydrogen.
    • - Low melting points
    • - Highly reactive
    • - Soft enough to be cut with a knife
  20. Alkaline earth metal
    • The elements in group two.
    • - Highly reactive but less reactive than ¬†metals
    • - When heated they burn with bright colourful flames
    • - often used in fire works
  21. Halogens
    • The elements in group 17
    • - extremely corrosive
    • - non-metals
    • - highly reactive
    • - melting points increase as you move down the group
  22. Noble gases
    • The elements in group 18.
    • - Odourless at room temperature
    • - Colourless at room temperature
    • - non-reactive
  23. Valence electron
    Valence electrons lie in the outermost electron shell of an element.