so i know that if alkali metals stay where there is air s.th happens and some new products come. want to know?

Question

plz help immediatly i am desprate

Answer 1

Alkali metals are highly reactive with water, H2O. Since there is water vapor in air, alkali metals will also react with the air when left exposed. When they react with water, they form strongly alkaline substances, hence their name. Going down the periodic table, they are lithium (Li), sodium (Na), potassium (K), rubidium (Rb), caesium (Cs), and francium (Fr). As an example, Na reacts with water to form the well known base sodium hydroxide, NaOH. Hydrogen gas, H2, is also a product of these reactions. So that's 2Na + 2H2O --> 2NaOH + H2. The reactions are increasingly vigorous as you go down the periodic table. I watched a video where a chunk of caesium was dropped into a glass bowl of water. The resulting explosion shattered the side of the bowl.

Because these elements are so reactive, they are never found in their elemental forms, but rather only in compounds. Francium is radioactive and is found only in trace amounts in ores. All of the alkali metals have to be stored in oil-filled containers to prevent reactions. As you go down the periodic table, each element is more highly reactive than the previous. Potassium will oxidize to form a black layer on its surface so quickly that it replaces itself before you can scratch it away from any significant area. These metals are also increasingly soft as you go down the group. A bar of potassium can easily be cut with a kitchen knife.

Answer 2

Alkali metals when recently cut and subjected to the oxygen in the atmoshpere oxidize.
Example:

K + O2 -> KO2

Answer 3

DavidK93 is correct...