Atomic theory

Which scientist developed the atomic theory

• Aristotle
• Dalton
• Democritus

The smallest unit of a pure substance that has the properties of that substance

• element
• atom
• neutron
• compound

Tags

NGSS.MS-PS1-1

Atoms are made up of three basic parts, which are -

• Protons, neutrons, electrons
• neutrinos, protons, neutrons
• quarks, protons, electrons
• electrons, neutrons, and quarks

The nucleus is made up of -

• neutrons and electrons
• protons and neutrons
• protons and electrons
• electrons and quarks

Tags

NGSS.HS-PS1-8

Protons have this charge -

• positive
• negative
• neutral
• no charge

Tags

NGSS.HS-PS2-4

Electrons have this charge - 

• positive
• negative
• neutral
• no charge

Tags

NGSS.HS-PS2-4

Neutrons have this charge -

• positive
• negative
• neutral
• They don't exist

What scientist is best known for his "Plum Pudding" model of the atom?

• J.J. Tomson
• Ernest Rutherford
• John Dalton
• Democritus

Tags

NGSS.MS-PS1-1

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

An atom's overall charge is ________.

• positive 
• depends
• neutral 
• negative