ATOMIC THEORY PART 1 (SEC. 1.2, FIRST HALF) Ancient Greeks to Ernest Rutherford

0.0(0)
Studied by 0 people
call kaiCall Kai
Locked
learnLearn
examPractice Test
spaced repetitionSpaced Repetition
heart puzzleMatch
flashcardsFlashcards
GameKnowt Play
Card Sorting

1/9

encourage image

There's no tags or description

Looks like no tags are added yet.

Last updated 8:03 PM on 9/26/26
Name
Mastery
Learn
Test
Matching
Spaced
Call with Kai
Chat

No analytics yet

Send a link to your students to track their progress

10 Terms

1
New cards

Democritus’ theory

  • if matter was broken into smaller pieces you would eventually reach a point where it could not be broken down further

  • atom atomos

  • this was rejected by aristotle who favoured empedocles’ 4 elements theory


2
New cards

who were the alchemists

  • explored the nature of matter

  • in many cultures

  • searched for the “elixir of life”


3
New cards

alchemists controbution to atomic theory

  • technological advances

  • (lab glassware and equipment, alloys handling procedures for dangerous chemicals)

  • allowed for the development of modern science


4
New cards

john dalton’s suggestion

  • atoms are solid spheres like billiard balls

  • did not address how things acquire electrical charge


5
New cards

john dalton’s suggestion

  • atoms are solid spheres like billiard balls

  • did not address how things acquire electrical charge


<ul><li><p>atoms are solid spheres like <strong>billiard balls</strong></p></li><li><p><strong>did not address</strong> how things acquire electrical charge</p></li></ul><p></p>
6
New cards

JJ thomson’s model of the atom

  • plum pudding

  • atom is a sphere of uniform positive charge with electrons embedded in it


7
New cards

ernest rutherford’s experiment

  • gold foil experiment

  • he bombarded a thin sheet of gold foil with positively

charged alpha particles (a Helium nucleus)



8
New cards

Gold foil experiment expected results

  • based on Thomson’s model, the alpha particles should

go straight through the gold foil (a uniform “+” charge

isn’t concentrated enough to repel the “+”alpha particles)

<ul><li><p>based on Thomson’s model, the alpha particles should</p></li></ul><p>go straight through the gold foil (a uniform “+” charge</p><p>isn’t concentrated enough to repel the “+”alpha particles)</p>
9
New cards

Gold foil experiment actual results

  • almost all the alpha particles did go straight through the

gold foil

  • about 1 in 20,000 was deflected off course or

rebounded straight back

  • the alpha particles must have hit something heavy

and positively charged

<ul><li><p>almost all the alpha particles did go straight through the</p></li></ul><p>gold foil</p><ul><li><p>about 1 in 20,000 was deflected off course or</p></li></ul><p>rebounded straight back</p><ul><li><p>the alpha particles must have hit something heavy</p></li></ul><p>and positively charged</p>
10
New cards

Ernest Rutherford model of the atom

  • the nuclear model

  • Atom has a very small, heavy nucleus surrounded by electrons, most of the atom is empty space