Round 100450 to 1 significant figure guys please help Im in tje middle of a test I don’t understand!!

Type the letter that represents the correct location for each particle type below.

Me i dont know what to do! the table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 10 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of the two atoms? both are unreactive. both are highly reactive. a is unreactive and d is reactive. a is reactive and d is unreactive.

How do you convert 4 mmol of bromobenzene to ml?