Introduction To The Atom

16 Questions | By Khanacademy | Updated: Mar 21, 2022 | Attempts: 90

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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
11.

An element's atomic number is
- A.
  
  The quantity of subatomic particles in the nucleus
- B.
  
  The number of protons
- C.
  
  The number of electrons
- D.
  
  The number of electron orbitals surrounding a nucleus
12.

An atom has a neutral charge if
- A.
  
  The nucleus consists of neutrons
- B.
  
  Protons repel electrons because they have different charges
- C.
  
  Quantized spin dynamics alter orbital strengths
- D.
  
  The number of protons equals the number of electrons
13.

The mass of one proton equals the masses of about
- A.
  
  20 neutrons
- B.
  
  2,000 electrons
- C.
  
  20,000 electrons
- D.
  
  100,000 neutrons
14.

The atomic weight of an element is the
- A.
  
  Weighted mass of the most common isotope of that element
- B.
  
  Weighted average of the masses of naturally-occurring isotopes
- C.
  
  Largest weight of an isotope of that element
- D.
  
  Relative weight percent of one atom to others in a compound
15.

Isotopes are
- A.
  
  Chemical compounds with the same states of electrons
- B.
  
  Atoms with the same number of neutrons but a different number of protons
- C.
  
  Atoms with the same number of protons but a different number of neutrons
- D.
  
  Chemical compounds with distinct electron orbitals
16.

What percent of matter is made of free space, at an atomic level?
- A.
  
  67.33%
- B.
  
  0.01%
- C.
  
  99.99%
- D.
  
  23.67%