Introduction To The Atom

10 Questions | By Khanacademy | Last updated: Jan 23, 2013 | Total Attempts: 47

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1.

In the original Greek, the word "atom" means
- A.
  
  Uncuttable
- B.
  
  Rotational
- C.
  
  Systematic
- D.
  
  Origin
2.

The positively-charged subatomic particle is a
- A.
  
  Neutron
- B.
  
  Graviton
- C.
  
  Proton
- D.
  
  Electron
3.

An electron is a
- A.
  
  Negatively-charged subatomic particle
- B.
  
  Semiconductor electrical substrate
- C.
  
  Packet of light energy emitted by atoms
- D.
  
  Electroweak interaction with material forces
4.

You can not know both an electron's ___________ and ____________ at any point in time.
- A.
  
  Size, shape
- B.
  
  Location, momentum
- C.
  
  Spin, vibration
- D.
  
  Charge, velocity
5.

What is an orbital?
- A.
  
  Quantum mechanic shifts an electron makes when an atom absorbs energy
- B.
  
  Chemical reaction between an electron and a proton
- C.
  
  Spinning path the electron particle makes around the nucleus
- D.
  
  Mathematical probability function of where an electron is likely to be
6.

One atomic mass unit equals
- A.
  
  The mass of an atom in a vacuum at zero degrees kelvin
- B.
  
  The mass of 1 proton or 1 neutron
- C.
  
  A unit to compare relative atomic masses
- D.
  
  The weight of an atom in a vacuum
7.

What is the negatively-charged subatomic particle?
- A.
  
  Neutron
- B.
  
  Graviton
- C.
  
  Proton
- D.
  
  Electron
8.

What is the uncharged subatomic particle?
- A.
  
  Neutron
- B.
  
  Graviton
- C.
  
  Proton
- D.
  
  Electron
9.

An electron gains potential energy as it
- A.
  
  Accumulates charge in response to the protons in the nucleus
- B.
  
  Moves away from the nucleus
- C.
  
  Interacts with gravitational fields
- D.
  
  Increases its radioactive decay
10.

I know what element an atom is by the
- A.
  
  Number of protons in the nucleus
- B.
  
  Atomic radius, in angstroms
- C.
  
  Number of neutrons in the nucleus
- D.
  
  String vibrations the atom emits when excited

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