History of the Atom

1
History of the Atom

• John Dalton agreed with Democritus that atoms
  exist. What part of Daltons theory was later
  proven wrong?
• Draw and name JJ Thomsons model of the atom.
  What subatomic particle is his significant
  addition to the theory?
• Sketch Rutherfords Gold Foil Experiment set up.
  What did he expect to happen? What was the
  actual outcome of the experiment?
• Draw the Bohr model of the atom. What was his
  significant contribution to atomic theory?

2
Basic Structure of the Atom

• How many protons are in bismuth-209?
• How many electrons are in 12151Sb-3?
• Name the significance of each of the subatomic
  particles.
• How do the subatomic particles compare in terms
  of mass?

3
Calculating Atomic Mass

• Define isotope.
• Calculate the atomic mass of neon. The three
  isotopes occur in the following abundances
  20Ne90.92, 21Ne0.257 and 22Ne8.82
• Review number 5 on your atomic mass practice
  handout.

4
Quantum Mechanical Model

• Which electron configuration rule states that
  electrons fill the orbitals on the lowest energy
  level first?
• How many unpaired electrons are in C?
• How many valence electrons are in Ca? Ag?
• Write the electron configuration for Ni. Draw
  the orbital diagram.
• Write the noble gas notation for iodine.

5
Energy and Electrons
c 3.0x108 m/s h 6.626x10-34 Js

• Describe the process of an atom giving off a wave
  of light.
• Which color has the highest frequency orange,
  yellow, green, or violet?
• What is the energy of a wave with a wavelength of
  470 nm?

6
Quantum Numbers

• For each of the 3d electrons in Mn, please give
  the set of four quantum numbers.
• What is the maximum number of electrons in any
  atom that could have these quantum numbers n2,
  l0?