chemistry c4 Flashcards
what are group 1 metals called?
alkali metals because they form alkaline solutions
what are the properties of group 1 metals?
shiny
good conductors of electricity
solid state at room temp
what happens to density going down group 1?
increases
what happens to melting point going down group 1?
decreases
what happens to reactivity going down group 1?
increases
why does the reactivity increase going down group 1 metals?
The easier it is for an atom to lose an electron, the more reactive it is
+ distance between nucleus and electron in outer shell increase down group
what are group 7s known as?
halogens
what colour is fluorine gas?
pale yellow gas
what colour is chlorine?
green gas
what colour is bromine?
orangey-brown liquid
what colour is iodine?
grey solid
what type of molecules are group 7?
diatomic molecules
what happens to density going down group 7?
increases
what happens to m.p + b.p going down group 7?
increase
group 7 reacts with metals to produce what?
salts
what happens to reactivity going down group 7?
decreases as it’s harder to gain electron than lose it and going down group distance between nucleus and electron increases
what is a displacement reaction?
a halogen ‘taking over’ a less reactive halogen
what are group 0 elements called?
noble gases
what are the properties of group 0 elements?
- unreactive as they have full outer shells
- nonmetals (gases)
- gases at room temp
- low boiling points
- low densities
what happens going down group 0?
boiling point increases
forces between atoms get stronger
density increases
