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?

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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

why do the isotopes of a particular element behave differently in nuclear reactions but the same in chemical reactions? chemical reactions involve changes to electrons in an atom; isotopes do not differ in electrons, and so they react the same way during chemical changes.

explanation:

venn diagram is pictorial representation with of circles showing the relation between two finite sets or things. the intersection part of two circles conveys the relation present in between those sets or things.

here in the venn diagram of sand and salt two circles represent sand and salt. but the area falling under the intersection of these circle represents the mixture of sand and salt.

so, in a venn diagram the mixture will be placed in a middle that is in between the intersection of two circles.