On the shoulders of giants



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Click on the Halogens (left bar) to answer these questions.

a. What is the halogen group number? ____17_______________

b. Are halogens metals or nonmetals? __nonmetals____________________

c. The term “halogen” means ____salt-former________________ and compounds containing halogens are

called ____________salts________.

d. How many electrons are in their outer shell? _____7_____________

e. What is their oxidation number? ______-1________________

f. What states of matter do halogens exist in at room temperature?

__________solid,liquid, and gas________________________

19. Click on Noble Gases (left bar) and answer these questions.

a. What is the group number? ___18______________

b. Why were these gases considered to be inert or stable? _______All noble gases have the maximum number of electrons possible in their outer shell (2 for Helium, 8 for all others), making them stable.

c. What is their oxidation number? _0___________________

20. Click on Rare Earth Elements ( Inner Transition) (left bar) and answer these questions.

a. On you periodic table, label the Lanthanide and Actinide series with your pencil.

b. How many Rare Earth elements are there? ___30________________________



c. Define trans-uranium. element of the lanthanide series and most of the elements in the actinide series are called trans-uranium, which means synthetic or man-made.

d. The Rare Earth metals are found in group _3 of the periodic table, and the 6th and 7th periods.


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