the groups Flashcards
properties of group 1
low melting point , low density and soft
what do group 1 react with
water , oxygen and group 7
when group 1 element reacts with water they produce
a metal hydroxide and hydrogen
as you down group 1
elements become more reactive , melting point and boiling point decrease
why are alkali metals so reactive
they have one electron to lose to gain a full outermost shell
why are metals more reactive as they go down the group
radius gets bigger so the electron is further away from its positive nucleus so it weakens the attractive force so the electron can be lost more easily
how to test for hydrogen
the squeaky pop test
how do you test for oxgyen
it relights a splint
how to test for chlorine
insert litmus paper into a test tube and it turns from red to white
what is a metal plus oxygen
metal oxide
what are the diatomic molecules
group 7 , nitrogen , oxygen and hydrogen
what do halogens produce when they react
halides
trend as you go down the halogens .
they become less reactive , melting point and boiling point increase
what is a diatomic molecule
a two atom molecule
why do halogens decrease as you go down the group
outer most shell gets further away from the positive nucleus so the attractive force to pull in other electron gets weaker so if the halogen cannot pull in another electron to complete its outer shell they can’t react
