Question

03.01 Atomic Theory Guided Notes

Objectives:
In the lesson you will:
explain how Dalton's atomic theory was modified, but not discarded
describe the structure of an atom
describe the electrical charges and forces that exist between protons, neutrons, and electrons
state the atomic masses of protons, neutrons, and electrons
Big Ideas:
Key Questions and Terms
Notes
What new scientific evidence led to changes in Dalton’s atomic theory?



What did J. J. Thomson discover about electrons?



What was Rutherford’s contribution to the structure of an atom?


Explain the process of how James Chadwick found the neutron.


Explain what can happen to scientific theories over time.


What is the structure of an atom?



What is a proton?



What is a neutron?



What is an electron?



What are the forces that exist inside an atom?



Explain how a neutral atom can become positively or negatively charged.


What are the atomic masses of protons, neutrons, and electrons?


How is the atomic mass of an atom determined and why are electrons not used in the calculation?


What is an amu?

Answer 1

1.. all atoms contain tiny negatively charged subatomic particles or electrons.

2..The atom, as described by Ernest Rutherford, has a tiny, massive core called the nucleus. The nucleus has a positive charge

3...he bombarded Beryllium with alpha particles from the natural radioactive decay of Polonium.

4..Theories can be improved or modified as more information is gathered so that the accuracy of