it get's hotter than a burning temperature
They form metal oxides.
They metals are stored in oil to minimize the reactivity with air. When alkali metals react with air, they quickly tarnish after begin cut, they burn easily.
Generally speaking, metals do not burn. However, with a great amount of heat, metals can bend and lose structural integrity.
Metals cannot 'burn'. Most likely, your 'burning' metal is enriched with other elements that burn. It can melt, it then just melts into liquid metal, then it is still metal.
they from to liquid form
No. Metals do not burn, only melt.
they form a salt
Metals are not decomposed by heating. Some metals burn, as magnesium.
no
Fluorides don't normally burn.
At a given temperature gases can react with metals.
Most all can, but there are a few different types that cannot burn through metal. Although these metals are mush lesser known than the more common kinds that do.
they form an ionic compound that mix together.