Why are all models of the atom conceptual models?

• We cannot see inside an atom to know what it looks like
• The evidence we gather tells us how atoms behave
• Atomic models try to predict atomic behavior
• All of these are true

What can you conclude from the fact that scientists continue to update the atomic model?

• New information about atoms continues to be discovered
• Old information about atoms is completely useless
• Scientists did not have any information about atoms until a few years ago
• Scientists still have no idea what atoms are like

What element is represented in this Bohr Model? 

• Carbon
• Hydrogen
• Aluminum
• Lithium

How many electrons does Si contain? (click to see image)

• 14
• 28
• 2
• None of these

Ernest Rutherford discovered that atoms were mostly _________________. 

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

Tags

NGSS.MS-PS1-1

What does the nucleus of an atom contain?

• Electrons & Neutrons
• Protons & Neutrons
• Neutrinos & Positrons

The majority of an atom's mass exists where?

• In the nucleus
• In the electron cloud
• In the space between the nucleus and the electrons
• In the neutrons

Any atom of the same element will always have the same number of _________

• neutrons
• protons
• isotopes
• atoms

A _____________________ is something that scientists use to represent an object or process

• mass
• matter
• model
• weight

In the gold foil experiment, most of the positively charged alpha particles passed through the gold foil, but some were deflected or bounced back.  What did we conclude because of this?  

• Atoms are small indivisible spheres
• Atoms are mostly empty space with a small, dense, positive center
• Atoms have negatively charged particles which orbit the nucleus
• Light is a wave, not a particle