The diameter of a mercury atom, atomic number 80, compared with ...

[Yolanda]

The diameter of a mercury atom, atomic number 80, compared with the diameter of a zirconium atom, atomic number 40, is approximately
 
  1) half as large
  2) twice as large
  3) the same size
 
  because the
  4) atomic masses are not appreciably different.
  5) greater nuclear charge pulls the orbiting electrons closer.
  6) atomic number and atomic diameter are directly proportional to each other.
  7) atomic number and atomic diameter are inversely proportional to each other.

Question 2

Orbital electrons do not spiral into the atomic nucleus because of
 
  1) electrical forces,
  2) the wave nature of the electrons,
  3) angular momentum,
  4) the discreteness of energy levels,
  5) quantum mechanical laws,
 
  and the electrons have discrete radii from the nucleus because
  6) the circumference of each orbit is an integral multiple of the electron wavelength.
  7) electrical forces act over discrete distances.
  8) energy levels themselves are discrete.

[Joy Chen]

Answer to Question 1

Answer: 3, 5

Answer to Question 2

Answer: 2, 6

[Yolanda]

Excellent

[ryansturges]

TYSM