multiple choice

1) what is the cubic crystal structure called where each side of the cube has one atom surrounded by other atoms?
a. faced-center
b. body-center
c.covalent bond

2) which one is the linear electron group geometry?
a. HCN
b. BF3
c. SO2
d.H2O

3) which one below is not the property of metallic bonds?
a. between metals
b. conducts electroicity
c. cannot be "hexagonal close-packed"
d. same kinds of structure as ionic crystals, plus one more