Lecture 4: The atom Flashcards
atoms are made up of
subatomic particles
metals properties
-conduct heat and electricity
-malleable (hammer)
-ductile (wire)
-shiny solid at room temp (not Hg)
non metal properties
-poor conduction
-gases at room temp
metalloids properties
properties of metals and nonmetals
Group 1
Alkali Metals
Group 2
Alkaline Earth Metals
Group 16
Chalcogens
Group 17
Halogens
Group 18
Noble Gases
neutral atoms
protons # = electron #
coulumbs law of electrostatic interaction
opposites attract
charges and force of attraction are
directly proportional
distance and force of attraction are
inversely proportional
strength of interaction depends on (2)
-magnitude of charges
-distance between them
Hard sphere model
john dalton, atoms like pool balls with hooks
Cathode Ray Tube
JJ Thompson, discovered electrons
oil drop experiment
harvey fletcher, measured electron charge and size
Plum pudding model
JJ thompson, electrons distributed through atom
Gold foil experiment
Ernest Rutherford, particles bounced off nucleus, discovered nucleus