ATOMIC THEORY Q2 MOD 1

Question 1

DEMOCRITUS

Answer 1

• everthing was mmade up of atoms (atomos)
• small particles
• indivisible
• no concrete evidence, purely theorize
• properties of an obj depended on the type of atom

salty- sharp atoms
sweet- round atoms

Question 2

ARISTOTLE

Answer 2

• 4 elements

wind, fire, earh and water

Question 3

JOHN DALTON

Answer 3

• everthing was made up of atoms (tiny indistructable spheres)
• atoms of diff elemnts form diff compounds

Question 4

THOMPSON

Answer 4

• cathode ray tube exp
• plum pudding model
• proves that atoms are positive charge with tiny negative charges

Question 5

RUTHERFORD

Answer 5

• gold foil exp
• atoms has masses- nucleus - center of atom
• the negative charges (electron) orbited around nucleus

Question 6

BOHR

Answer 6

• electrons moved around nuclues in fixed orbits/ shells (planatary model)
• shell closer to nuc. holds less elec and vice versa
• did not satisfy heinsbherg uncertinty principle
• postion of elec cannot be possible to know

Question 7

SCHRODINGER

Answer 7

• quantum mech model
• elec did not move in circula rmotion
• it is more like elec. cloud
  atomic orbital probability of finding elec is the highest