Unit 1 Section A Summary HW Problems Pt. 3

#12:
a. Hydrogen (3 atoms), phosphorous (1 atom), oxygen (4 atoms)
b. Sodium (1 atom), oxygen (1 atom), hydrogen (1 atom)
c. Sulfur (1 atom), oxygen (2 atoms)

#13:
a. metals
b. nonmetals
c. nonmetals
d. metals

#14:
Silicon (Si) and germanium (Ge).

#15:
It would be malleable and bend/dent rather than shatter.

#16:
There are some nonmetals that are gases, which are nonconductive.  Also, the nonmetals simply don't conduct electricity as well as metals.

#17:
Metals are malleable rather than brittle, so they will not break.
Metals can be pressed into sheets, so they're easier to produce.
Metals can be melted down to make it more versatile for producing different currencies.