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Science 8: Ch 6.1 Development of the Atomic Theory (pages164-171)
Key Concept
Scientists have done ___________________ that have
revealed important ___________ about the structures of
_________________.
Around 440 BCE, Democritus thought you could keep cutting
something in half until you couldn’t cut it anymore. What
did he call it?
What does the word atom, or atomos, mean in Greek?
We now know matter is made up of what?
Define atom.
By the late 1700’s, what had scientists learned about
elements and compounds?
Who created the atomic theory?
What are the three ideas found in the atomic theory?
1.
2.
3.
Has Dalton’s atomic theory changed since it was first
published?
What did JJ Thomson discover about atoms?
The negatively charged particle Thomson discovered is
called what?
Where did Thomson think the electrons were found?
What is the plum-pudding model, or what we could call
today the chocolate chip ice cream model?
In Rutherfords experiment “Shooting Gallery”, Rutherford
expected the beam of positively charged particles to move
in what direction?
Where did most tiny particles end up?
But some of the tiny particles were deflected. What does
that mean?
Based on his results, Rutherford determined that most of the
matter in an atom is found where?
Rutherford revised the atomic theory in 1911 and proposed
there was a dense part of an atom found in the center. What
did he call this?
And because the positively charge particles in the beam
were pushed away from the nucleus, he determined the
nucleus had what charge?
From Rutherford’s results, what was an important idea
regarding the atom and it’s amount of space?
In 1913, Niels Bohr, studied how atoms reacted to what?
What did Bohr learn about electrons?
In Bohr’s explanation, where could electrons move?
Based on Werner Schrödinger and Werner Heisenberg’s
work in the 20th century, what did they learn about
electrons?
Define electron cloud.
Is an orbital different from an electron cloud?
Each electron cloud exists at a certain _________ level.
Do elements move in a constant motion?
What is the negatively charged element attracted to?
Electrons move by gaining or losing what?
Can electrons be found in between energy levels?
Atoms are tiny. How many atoms are contained in a penny?
As of present, can we see an actual picture of an atom?