Name the compound br-ch3-c(ch3)3 ?

1 -bromo-2-dimethylpropane

Explanation:

Longest chain is a propane. We start numbering from the C attached to the Br to give it the lowest possible number. The second C has two methyl groups attached to it hence the prefix di-.

the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.

answer; talc and gypsum;