Discovery of the Atom

Ernest Rutherford discovered that atoms were mostly _________________. 

• negatively charged
• positively charged
• electrons
• empty space. 

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: 
A) Ernest Rutherford
B) J.J. Thomson
C) John Dalton

• B,C,A
• C,A,B
• A,C,B
• C,B,A

Which word would closely define the term "atomos"?

• Incredible
• Indivisible
• Indelible
• Independent

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

Which one of the following discoveries came first?

• electrons

• neutrons

• quarks

• atoms

Which scientist discovered the electrons?

• Dalton

• Thomson

• Atristotle

• Bohr

Rutherford and his students did experiments that showed

• quark

• nucleus

• proton

• electron

Bohr discovered that electrons are located in

• the nucleus

• inside protons

• electron cloud

• circular orbits around the nucleus

What is a particle with one negative charge called?

• electron

• proton

• quark

• neutron