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?
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
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?
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_____________________________