Potassium is the most reactive. All of the elements in the first column of the Periodic Table are extremely reactive to water. These elements all have on more electron than the stable noble gas configuration (an octet in the valence shell), and so by getting rid of that extra valence electron, the element becomes much more stable. In contact with water, these elements will give this extra electron off to the water, forming hydroxide (OH-) and becoming a positive ion. For example, when you add potassium metal (K) to water, you will form the positive ion K+, which has the same electron configuration as argon, with a completely filled valence shell. The other metals listed will not react very quickly at all with water (unless it is very acidic water).
potassium magnesium doesn't exist. They are two separate "metals".
All are metals.
These metals are very different.
You get a mixture of potassium and magnesium. They're metals; they don't react with each other.
Potassium
Metals: potassium, magnesium, aluminum, calcium, iron (forming Fe2+ ions)
No. These are not heavy metals. They are salts of non heavy metals.
No, Potassium is more reactive than magnesium. As a general rule, the alkali metals, those in the far left column of the periodic table, are the most reactive of all the metals.
Some of these metals are: Calcium, Magnesium, Sulfur, Sodium, Potassium, ...
Group I metals will have the most violent reaction.
magnesium (in chlorophyll)
Metals which are more reactive than aluminium. Eg= Sodium, Magnesium, Potassium, etc