History Of The Atom

Question 1

what did democritus suggest?

Answer 1

everything is made up of atoms (atomos)

Question 2

what did John Dalton suggest

Answer 2

everything is made up of particles and they are hard spheres and cannot be split

Question 3

what did JJ Thomson suggest and discover?

Answer 3

discovered electrons and said they were evenly distributed in the atom. he came up with the plum pudding model

Question 4

what did Rutherford suggest

Answer 4

solar system model: stones have positive nucleus surrounded by negative electrons in orbit. discovered proton

Question 5

what did Bohr find out?

Answer 5

electrons are in fixed orbit in shells around the nucleus

Question 6

what did James chadwick say?

Answer 6

discovered neutron

Question 7

explain and describe the plum pudding model

Answer 7

imagined as a sphere with a positive charge with negatively charged electrons scattered inside it

Question 8

explain and describe how Rutherford proved JJ Thomson’s plum pudding model wrong

Answer 8

Rutherford designed an experiment called the gold foil experiment. a beam of alpha particles was aimed at thin gold foil. some particles bounced back proving the positively charged particles were being repelled by a tiny concentration of positive charge in the atom. the plum pudding model was replaced by the nuclear model