Metallic niobium forms body-centered cubic unit cells with α = 0.330 nm at 18℃. calculate the atomic radius of niobium using this information.
if you could give me step by step directions, i would really appreciate it.

the correct answer would be d. hope this !

i think that the answer is c

substituting a hydrogen atom with a halogen in a hydrocarbon:

- the single bond remains single. a is wrong.

- the bond with hydrogen is as strong as with a halogen. c is wrong

- a hydrocarbon is saturated if there is no double bond. we do not know that so d is wrong.

- carbon will always have four valence electrons. e is wrong.

by elimination, the correct answer is b. the boiling point of the new compound increases.