reactivity series Flashcards
what do alkali metals produce when they react with water
metal hydroxide and hydrogen
sodium + water—
sodium hydroxide + hydrogen
what happens when lithium reacts with water
fizzes, becomes smaller until disappears
when sodium reacts with water…
melts into a ball, fizzes rapidly, becomes smaller until disappears
when potassium reacts with water
melts into a ball, lilac flame, disappears with a small explosion
what happens when group 1 takes part in a reaction
lose outer electron and form +ve charged ion
why does reactivity increase as you go down the group 1
- outer electron further from nucleus
- outer electron is lost easier
- atoms become larger
what are halogens
group 7 elements
what happens in a reaction if one metal is MORE reactive than another
it DISPLACES it
what happens as you go down group 7
- less reactive
- higher melting and boiling point
- higher relative atomic masses
why do the metals become less reactive down group 7
harder to gain an extra electron- outer shell is further from the nucleus
