grouping elements 17-18

when Halogen reacts with alkali metal what do they form

a salt

why is hydrogen placed above group 1

atoms of the alkali metals also have only one electrons in their outer level

hydrogen is a colorless odorless gas at room temperature so its physical properties are more like which class of elements?

non metals

why is hydrogen (H) set apart from the other elements in the table

the properties of hydrogen do not match the properties of any single group

why are the Halogens very reactive especially with metals

their atoms need to gain only one electron to have a complete outer level

fluorine, chlorine, bromine, iodine, and astatine make up group 17 the Halogens. why are these elements grouped together.

they are all reactive nonmetals that have similar chemical properties

hydrogen

1 valence electron / reactive

group 17 Halogens

7 valence electrons / highly reactive

group 18 noble gases

8 valence electrons except helium which has 2

although the chemical properties of the hooligans are similar the physical properties are very different explain

chlorine is a yellowish green gas Bromine is a dark red liquid and iodine is a dark grey solid

what physical properties do noble gases share?

colorless,oderless gasses at room temperature

list two interesting facts about hydrogens

hydrogen is found in starts most abundant element in the universe used for rocket fuel

why are the noble gases unreactive

they have a full set of electrons in their outer level so they don't need to gain or lose electrons