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
