Discovery of the Atom

Ernest Rutherford discovered that atoms were mostly _________________. 

• negatively charged

• positively charged

• electrons

• empty space. 

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

Rutherford's gold foil experiment provided evidence that...

• negative and positive charges are spread evenly throughout the atom.

• alpha particles have a positive charge.

• gold is not a dense as previously thought.

• there is a dense positively charged nucleus at the center of an atom.

Tags

NGSS.MS-PS1-1

What Greek philosopher first spoke about the idea of an atom?

• Democritus

• Dalton

• Thompson

• Rutherford

The particles with no charge in an atom are the _______.

• electrons

• neutrons

• protons

• protons and neutrons

Tags

NGSS.MS-PS1-1

This was the first model of the atom ever proposed. It was simple and described atoms as tiny spheres that could not be broken down into smaller pieces.

• Democritus's model of the atom

• The "Plum Pudding Model" of the atom

• The "Rutherford Model" of the atom

• The "Solar System Model" of the atom

Tags

NGSS.MS-PS1-1

This model was developed after J.J. Thompson discovered electrons, a particle smaller than an atom. Is shows electrons floating freely in a positive space.

• The "Plum Pudding Model" of the atom

• The "Rutherford Model" of the atom

• Democritus's model of the atom

• The "Solar System Model" of the atom

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

Which word would closely define the term "atomos"?

• Incredible

• Indivisible

• Indelible

• Independent

Tags

NGSS.HS-PS1-7

Which one of the following discoveries came first?

• electrons

• neutrons

• quarks

• atoms