1.)  Why are the properties of elements different?

2.)  How many elements occur naturally?

3.)  Atoms of the same element with different numbers of neutrons are called ___.

4.)  What is the number over the symbol for the element (on the Periodic Table) called?

5.)  What determines the placement of an element on the Periodic Table?

6.)  How many periods are there on the Periodic Table?

7.)  Why are the two rows at the bottom of the Periodic Table?

8.)  How many groups are there on the Periodic Table?

9.)  Why was radon (Rn) not in one of the balloons?

10.)  What gas was in the "lead balloon"?

11.)  To make glass, ___ and metal oxides are mixed.

12.)  When the alkali metals (lithium, sodium, and potassium) are put into water, what gas is produced?

13.)  Why do we want to use relatively small pieces of these elements in the experiment?

14.)  What happened when potassium was put into water?

15.)  What happens to the size of an atom as you move across a period from left to right?

16.)  A repeating property is called a ___ property.

17.)  Why is glass made with potassium stronger than glass made with sodium?

18.)  What is one of the elements that Mendeleev predicted the existence of?  (There are three.)

19.)  What American rearranged the Periodic Table in 1944?

20.)  What ultimately determines the placement of elements on the Periodic Table?

21.)  What are the electrons in the outer energy level of an atom called?

22.)  Electrons fill the ___ energy level first.

23.)  There are no more than ___ electrons in any one orbital.

24.)  Nitrogen has ___ electrons in its outer shell.

25.)  What part of this video did you like the best?  What segment helped you the most?

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