Name ______Period ____
The uncertain location of electronshttp://ed.ted.com/lessons/the-uncertain-location-of-electrons-george-zaidan-and-charles-morton
1. Can you think of an element that has no neutrons in its nucleus?
AIt doesn’t exist
BYes, hydrogen
CYes, helium
DYes, gold
2. Which of the following statements is true:
AProtons are positively charged and neutrons are negatively charged
BProtons are positively charged and negatrons are negatively charged
CProtons are positively charged and electrons are negatively charged
DProtons are negatively charged and neutrons are neutral
3. The identity of an atom is determined by ______.
AThe number of protons and neutrons in its nucleus
BThe number of electrons around its nucleus
CThe number of protons in its nucleus
DThe number of protons and neutrons in its nucleus, and the number of electrons around its nucleus
4. Electrons behave as particles or waves depending on ______.
AThe time of day
BHow they are observed
CTheir mood
DThe atom they’re in
5. How do we know what atoms “look” like?
ABy looking through a really powerful telescope
BWe don’t – we just build a model for what we think is there and keep testing that model over the years until it fails and we have to build a better one
CBy looking atomic structure up in books
DWe don’t – we just build a model for what we think is there
6. Past a certain distance from the nucleus, the probability of finding an electron starts to decrease more or less exponentially. How would you represent this on a graph? Draw a quick sketch and label the axes. How would you account for the “past a certain distance from the nucleus” part of the question in your sketch?
7. At about 3:02, an atom of Lithium loses an electron to an atom of Fluorine. Is this a chemical reaction? Why or why not? Why are there “+” and “-” signs on the elements after the electron is transferred?
8. Why did we choose gold for the last element in the video?
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