Noble gases, halogens, alkali metals and transition metals Flashcards
What are the properties of the noble gases?
Low melting and boiling point which increases as you go down
Gases at room temperature
Non-flammable and colourless
What trends are seen with halogens as you go down group 7?
Halogens decrease in rectivity - its harder to gain an extra electron because the outer shell is further away from the nucleus
Melting and boiling points increase
What do more reactive halogens do to less reactive ones?
Displace them.
What are the properties of the alkali metals?
They are soft
Low melting and boiling points
Increase in reactivity as you go down the group
What happens when alkali metals react with water?
They react vigorously to produce a metal hydroxide and hydrogen gas.
What happens when alkali metals react with chlorine?
They react vigorously to form white metal chloride salts.
What happens when alkali metals react with oxygen?
They react to form a metal oxide and the metal goes from shiny to dull.
What happens when lithium reacts with oxygen?
It burns with a crimson flame and releases bubbles of hydrogen gas.
What happens when sodium reacts with oxygen?
It burns with a yellow flame.
What happens when potassium reacts with oxygen?
It burns with a lilac flame.
How do transition metals compare to alkali metals?
They have higher melting points
Higher densities
Are stronger and harder
Are less reactive
