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ENGAGE: Demonstration Presentation

Atomic Theory Atomic Structure and Nuclear Chemistry

•  What you have learned about how scientists discovered the structure of an atom when they were unable to directly

observe it?



ENGAGE: Demonstration Presentation C.6AB

Atomic Theory

The student knows and understands the historical development of atomic theory. The student is expected to:

understand the experimental design and conclusions used in

the development of modern atomic theory, including: •  John Dalton’s Postulates •  J.J. Thomson’s discovery of electron properties •  Ernest Rutherford’s nuclear atom •  Niels Bohr’s nuclear atom



ENGAGE: Demonstration Presentation C.6A

Atomic Theory

•  Where did the concept of the atom originate, and what were the limitations of this initial theory?

•  How did Dalton’s postulates contribute to the development of modern atomic theory?

•  What was J.J. Thomson’s contribution to the development of the model of the atom?

•  What did Ernest Rutherford discover that significantly change the model of the atom?

•  How did Niels Bohr’s research further develop the Rutherford model of the atom?




Atomic Theory



1803 1897 1912 1922

1800 1900 2000

John Dalton “I propose that matter is made of extremely small particles called atoms. These particles cannot be divided into smaller particles”

J.J. Thomson “There is a particle that is smaller than the atom that has a negative charge. I propose a model of the atom that has negative particles scattered throughout an cloud of positive charge”

Ernest Rutherford “The atom is made up of mostly empty space with a small center of positive charge called the nucleus. The electrons occupy the space outside the nucleus”

Niels Bohr “The atom has a small center of positive charge with the electrons occupying energy levels around the nucleus”


Atomic Theory



1803 1897 1912 1922

1800 1900 2000

John Dalton J.J.Thomson E. Rutherford Niels Bohr

All matter is made up of particles called atoms which cannot be divided into smaller particles

An atom is made up of negative particles evenly scattered in a cloud of positive charge

+ e - e -

e -

e -e -

e -

e -e -

e -

An atom has a positively charged nucleus and negative electrons around it

nucleus + e-

1st Energy level

The electrons in the atom can only occupy certain energy levels around the nucleus

-e

-e-e

-e

-e -e

-e-e

-e

-e


Atomic Theory

Remember what you have learned about ��the history of atomic theory.

You will learn more about the scientists that contributed to modern atomic theory, including the experimental designs

they used and the conclusions they found.




Atomic Theory

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