Scientists and Their Experiments

1
Scientists and Their Experiments

• By Tina August

2
Name the Scientist

• This scientist said it was impossible to know
  both the position and momentum of electrons in a
  particular instant.

3
Answer

• Werner Heisenberg

4
Name the Scientist

• This scientist fired alpha particles at gold
  foil and observed how they were scattered.

5
Answer

• Ernest Rutherford

6
Name the Scientist

• This scientist proposed the arrangement of the
  elements on the period table based on the trends
  of known elements

7
Answer

• Dmitri Mendeleev

8
Name the Scientist

• This scientist watched the deflection of charges
  in a cathode ray tube and put forth the idea that
  atoms are composed of positive and negative
  charges.

9
Answer

• J.J. Thomson

10
Name the Experiment

• Robert Millikan

11
Answer

• Millikan calculated the charge on an electron by
  examining the behavior of charged oil drops in an
  electric field.

12
Name the Theory

• Max Planck

13
Answer

• Planck developed the Quantum Theory by figuring
  out that electromagnetic energy is quantized.
  This means for a given frequency of radiation,
  all possible energies are multiples of a certain
  unit of energy called a quantum. Energy changes
  occur in small steps. E hv is the constant.

14
Name the Theory

• John Dalton

15
Answer

• Dalton was the first to present some basic
  ideas about atoms There are many different kinds
  of atoms called elements, which combine to form
  compounds that contain the same ratio of elements.

16
What is the Significance?

• The de Broglie Hypothesis

17
Answer

• Louis de Broglie said that all matter has wave
  characteristics, meaning that sometimes the
  behavior of electrons is better described in
  terms of waves than particles.

18
What is the Significance?

• The Heisenberg Uncertainty Principle

19
Answer

• Werner Heisenbergs principle meant, in terms of
  atomic structure, that electron orbitals do not
  represent specific orbits like those of planets.
  An orbital is a probability function describing
  the possibility of finding an electron in that
  space.

20
What is the Significance?

• The Bohr Model

21
Answer

• Neil Bohr used the quantum theory to predict
  that electrons orbit the nucleus at specific,
  fixed radii. This works for atoms and ions with
  only one electron, not more complex ones.