History Of The Atoms

Question 1

What did John Dalton say about the atom ?

Answer 1

18:00 - “ Atoms are solid spheres”

Question 2

What did JJ Thompson say about the atom ?

Answer 2

1897 - plum pudding model

“The atom is a ball of positive charge with negative particles ( electrons ) stuck in it .

Question 3

What did Rutherford say about the atom

Answer 3

1909

cloud of negative electrons
Positive nucleus
“Lots of empty space “

Question 4

How did Rutherford figure out that the centre was positive?

Answer 4

He did an experiment and fired positive alpha particles at the atom and some repelled right back so the centre must be positive

Question 5

What did Bohr say about the atom?

Answer 5

electrons in a “cloud “ around the nucleus of an atom , As Rutherford described would be attracted to nucleus causing the atom to collapse

Bohr proposed that the electrons orbit the nucleus in fixed shells