History of Atoms

Who proposed that matter was formed of small indivisible particles?

• Dalton

• Thomson

• Democritus

• Chadwick

What contribution did John Dalton make to atomic theory? 

• He discovered that every atom was positively charged. 

• He discovered that every element consisted of one type of atom.  

• He discovered that atoms had nuclei. 

• He discovered that atoms could be divided into smaller parts. 

Tags

NGSS.HS-PS1-7

Place the following scientists in order, from earliest to latest: 
Ernest Rutherford
J.J. Thomson
John Dalton

• C,A,B

• A,C,B

• C,B,A

• B,C,A

Who developed the solid-sphere model of the atom?

• JJ Thomson

• Ernest Rutherford

• Neils Bohr

• John Dalton

The history of the Atomic Theory involves many changes from its early form. Theories change because

• people decide to no longer agree with them.

• all theories must be changed after a certain time.

• new evidence is found that allows the theory to be changed.

• when scientists die, their theories are always changed.

The Cathode Ray Tube experiment led to this model that was developed by ___.

• JJ Thomson

• John Dalton

• Ernest Rutherford

• Democritus

Place the following atomic models in order, from earliest to latest:

• B, C, A

• C, A, B

• A, C, B

• C, B, A

What contribution did John Dalton make to atomic theory? 

• He discovered that every atom was positively charged.

• He discovered that every element consisted of one type of atom 

• He discovered that atoms had nuclei 

• He discovered that atoms could be divided into smaller parts

Tags

NGSS.HS-PS1-7

Who proposed the plum pudding model of the atom?

• Niels Bohr

• J.J. Thomson

• Ernest Rutherford

• John Dalton

Which experiment led to the discovery of the nucleus?

• Gold foil experiment

• Cathode ray experiment

• Oil drop experiment

• Photoelectric effect