Thomson atomic model Edpuzzle - Mrs. Tereshko

Democritus states that

_________ can vary in size and shape

names the particles "______" which means indivisible

everything is the world is made up of ______ particles surrounded by ______ space

- particles

- atomos

- tiny, empty

what are Aristotles 4 elements?

earth, wind , fire, water

observations and conclusions of John Dalton

- atoms could not be ______ or _____

- Common substances always broke down into the same _____ in the same ______

- various compounds were combination of _____ and different elements

- created, destroyed

- elements, proportions

- atoms

Thomson atomic model is also called the ______ _____ model

Plum pudding

What did JJ Thomson discover about the atom?

Negative electrons

Why was JJ Thomson's model called the chocolate chip cookie model/ plum pudding model?

Describes the atom as a sphere of positively charged matter with negatively charged electrons

Why was Rutherford's gold foil experiment able to disprove Thomas's model of the atom ?

The positively charged alpha particles were supposed to go through the gold foil if Thomson's model was correct, but instead, some of them bounced back

What did Rutherford conclude from his experiment?

Atoms were mostly empty space with most of the mass found in the center of the atom

rutherford called the center of his atom model the

nucleus

The Bohr model has

electrons circiling the nucleus of an atom at fixed energy distances

Bohr said that electrons were able to do what?

jump orbits but could not exist between the orbits

it was found that electrons behave like both discrete particles and

waves

the uncertainty model states that we can't be certain of an electrons?

position and speed

the current model of an atom is called the

quantum model