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What is ATOM?

Do you guys ever heard about an atom? what is the meaning of it?

Multiple Choice

Atom is...

• the smallest particles

• the biggest particles

Explanation

So, you already guessed it right about what an atom is, but hold on that's not all. We still need to know more about an atom... The scientists who speculated about the atom had a different perspective, thus it lead to different argument and ended up in development of atom models, so check it out on the next slide

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The Development of Atom Models by Scientists

Dalton's Model: Stuff can be broken into elements (the things listed on the periodic table).Elements are atoms with different masses.Compounds are a combinations of elements. You know, like water, salt or pizza.

The Development of Atom Models by Scientists

J.J. Thomson: In this model, the electrons are the small things and the rest of the stuff is some positive matter. This is commonly called the plumb pudding model because the electrons are like things in positive pudding.

The Development of Atom Models by Scientists

Rutherford Scattering: he found it through his experiment that, if the electron was small and negative, then the atom must have a small positive nucleus with the electrons around them.

The Development of Atom Models by Scientists

Niels Bohr: Electrons should move around the nucleus but only in prescribed orbits. When jumping from one orbit to another with lower energy, a light quantum is emitted.

For your better understanding, please watch the video on the next slide 

The 2,400-year search for the atom - Theresa Doud by TED-ed channel

https://www.youtube.com/watch?v=xazQRcSCRaY

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it seems that you already understand enough about the development of atom models, now please follow the teacher's instruction to play quiz and get the game code... GOOD LUCK