Do you happen to know the blanks for this? :Atomic masses on the periodic table are not whole numbers because it represents the ______mass of all the known_________ of that element.
group 1 elements are alkali metals, group 2 elements are alkaline earth metals, group 17 elemets are halogens & group 18 elements are noble gases. (:
first blank: average
second blank: isotopes
i love chem. (:
you are my hero! haha thank you so so so much! :D
i meant group 17 elemeNts*
why thank you(: