The molar mass of silicon (\ce{Si}SiS, i) is \pu{28.09 g/mol}28.09 g/mol28, point, 09, space, g, slash, m, o, l. Calculate the number of atoms in a \pu{92.8 mg}92.8 mg92, point, 8, space, m, g sample of \ce{Si}SiS, i.
Write your answer in scientific notation using three significant figures.

answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.

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.