Study your flashcards anywhere!

Download the official Cram app for free >

  • Shuffle
    Toggle On
    Toggle Off
  • Alphabetize
    Toggle On
    Toggle Off
  • Front First
    Toggle On
    Toggle Off
  • Both Sides
    Toggle On
    Toggle Off
  • Read
    Toggle On
    Toggle Off

How to study your flashcards.

Right/Left arrow keys: Navigate between flashcards.right arrow keyleft arrow key

Up/Down arrow keys: Flip the card between the front and back.down keyup key

H key: Show hint (3rd side).h key

A key: Read text to speech.a key


Play button


Play button




Click to flip

12 Cards in this Set

  • Front
  • Back
*first contribution to the atom
*said that all matter is made of atoms and that atoms are indestructible
Dalton's Atomic Theory
1. elements made of tiny particles called atoms
2. all atoms of a given element are identical
3. atoms of a given element are different from those of any other element
4. atoms of one element can combine with atoms of other elements to form compounds; a given compound always has the same relative numbers and types of atoms
5. atoms are indivisible in chemical processes; atoms are not created or destroyed in chemical reactions- they change the way atoms are grouped together
problems with dalton's atomic theory
things have changed and we now know that atoms can be subdivided into quarts
*explained law of constant composition (given compound always has same composition, regardless of where it was found)
*also contributed to meteorology
JJ Thomson
*atoms of any element can be made to emit tiny negative particles
*plum pudding model
*JJ Thomson
*showed protons and electrons scattered within the atom
*particles are charged
*cation (+) and anode (-)
coined the term electrodes which led to electrons!
*gold foil experiment
*said that Thomson's model could not be correct because of the large deflections of the partices
*shot particles at gold foil; some went through and other were deflected (measured angle and was able to identufy)
*he concluded that there was empty space within atoms and that they had a nucleus, which held the protons
James Chadwick
*partner to rutherford
*showed that the nucleus contained neutrons also!
Neils Bohr
*quantum theory (of electrons)
*concept of periods and energy levels (2,8,18) where electrons "hang out"
*Bohr model of the atom- electrons can be quantumized
Heisenburg’s Law of Uncertainty
we don’t know the velocity (very fast) of the electrons moving among the principle energy levels (2, 8, 18)- but they do move among then