Chem Unit 2- Atomic Structure

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

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

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

J.J. Thomson provided evidence that an atom...

• is the smallest particle of matter
• contains negatively charged particles
• has an overall negative charge
• has an overall positive charge

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.HS-PS1-8

An atom's overall charge is ________.

• positive 
• depends
• neutral 
• negative 

Atoms of different elements are exactly alike

• Always true
• Always false
• Sometimes true

This particle is found in the nucleus and has no charge

• Neutron
• Proton
• Electron

Tags

NGSS.HS-PS1-8

The weighted average of the masses of all naturally occurring isotopes of an element is

• Atomic number
• Atomic Mass
• Atomic weight

Which particle contributes the negative charge to the atom?

• proton
• electron
• neutron
• nucleus

What is the electrical charge of a proton?

• 1+
• 1-
• neutral
• 2-