On the shoulders of giants



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Click on Metalloids to answer these questions.

a. On your periodic table, draw the black stair-step line that distinguishes metals from nonmetals.

b. Metalloids have properties of both ___metals_____ and ____nonmetals_________.

c. Define semiconductor __________elements that conduct some things_________________________.

d. Name two metalloids that are semi-conductors. _____silicon_______and ___germanium,_______.

e. This property makes metalloids useful in ____computer________and ___calculater___________.

17. Click in Nonmetals to answer these questions.

a. What are the group numbers? ____14_______ through ___16_________

b. List four characteristics of ALL nonmetals. __not able to conduct electricity or heat very well___very brittle, and cannot be rolled into wires or pounded into sheets. _________________________

c. What two states of matter do nonmetals exist in at room temperature?

___gasses solids______________________

d. The nonmetals have no _____matalic luster__________and do not ___reflect light_________________.

e. What are the oxidation numbers of the nonmetals? __________±4, -3, and -2_____________

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

a. What is the halogen group number? ______17_____________

b. Are halogens metals or nonmetals? ________theyre all 3______________

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

called ______salt______________.

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?

_________all three_________________________

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? ______because their oxidation number of 0 prevents the noble gases from forming compounds readily__________________

c. What is their oxidation number? ____________________

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. ______snythetic or man made_____________________________



d. The Rare Earth metals are found in group _____3__________and periods _____6_________and

________7_______.


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