Atomic Theory

All matter is made of what?

• energy 
• atoms 
• electrons 
• compounds 

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

• J.J. Thomson

• Ernest Rutherford
• John Dalton
• Democritus

Tags

NGSS.MS-PS1-1

What is the smallest particle of an element?

• atom
• proton
• electron
• neutron

An atom's overall charge is ________.

• positive 
• depends
• neutral 
• negative 

Which scientist disagreed with the idea that atoms existed?

• Democritus
• Aristotle
• Rutherford

This contains most of the mass of an atom

• Electron Cloud
• Nucleus
• Electron
• Isotope

What is the amu of an electron

• Almost zero
• 1
• 2
• 3

Who came up with this model of an atom pictured?

• J.J. Thompson
• Ernest Rutherford
• Neils Bohr
• James Chadwick

Tags

NGSS.MS-PS1-1

Which word would closely define the term "atomos"?

• Incredible
• Indivisible
• Indelible
• Independent

The atomic number for Oxygen is 8, so

• there are 8 protons in the atom
• the atomic mass is less than 8
• the mass of the atom is 8
• the atom is decaying