atomic developemnt thoery

Question 1

they all contributed to the question

Answer 1

what does an atom made of

Question 2

democritus 440 BCE

Answer 2

that everything in the world was made up of tiny particles surrounded by empty space.

They vary in size and shape depending on the substance they composed off

called it atomos – indivisible (unable to divide)
purely theoretical

Question 3

aristotle

Answer 3

matter was made up of 4 elements (water, wind fire and earth)

Question 4

john dalton 1766-1844

Answer 4

said that common substances alays breakdown to the same elements and the same amnt

compounds made up of atoms of different elements, each of a particular size and mass

can be created nr destroyed

Question 5

jj thomson

Answer 5

1897 discovery of electron
atoms were uniformly packed speheres of postive matter packed with negativley charged electrons

his modeldidnt stick around

Question 6

ernest rutherford

Answer 6

a student of thompson?

father of nuclear age

alpha particles to gold foil
cicnlded that atoms cocnsist of large space, with just few electrons

all of the weight as centered, “nucleus”

Question 7

niels bohr

Answer 7

one of thimpson student
expanded rutherfrods theory

electrons orbit the nucleus at fixed distance and energies

able to jump from one level/ orbit to another but not to exist in the space

planatary model