00:01
For the first part of this question that looks at corrosion, we have to appreciate the definition of corrosion first before we're related to alkali metals.
00:10
So if we are looking at corrosion, corrosion by definition is the deterioration or the breakdown of a solid material due to the chemical reaction with a corrosive substance.
00:22
So when we are looking at alkali metals, alkaline metals because of their high reactivity, they are considered.
00:31
Corrosive substances for that reason they give up their one electron easily and react readily with many different substances so this is why we are saying they are corrosive materials because they easily react with other compounds then looking at the next one if we are looking at alkali metal ions they are non -corrosive because they have reached their ionic state that is they have already given up their loosely held electron.
01:04
So they do not contain any other valence electrons to give away.
01:09
They have already attained stability.
01:12
So looking at a metal, it is corrosive because it still has that one electron that it can readily lose.
01:20
But once it is lost that to form now an iron, it is now stable.
01:26
It no longer has a loosely held electron to give to the next element.
01:31
That is it is no longer reactive...