Most probably you mean Potassium (symbol K, kalium(Latin), Kali or potash)
Elements are more reactive as you go down the periodic table and to the left.
The element with the lowest density is hydrogen.
The boron family is moderately reactive. Boron itself is a relatively unreactive element, while the elements below it in the group, such as aluminum, can be more reactive due to their ability to form stable compounds with other elements.
Hydrogen
Fluorine is more reactive than oxygen. It is the most reactive non-metal element and readily forms compounds with almost all other elements.
Iron
An element is said to be chemically reactive when it combines with another element. These two elements will create a new compound.
Chlorine is a Highly reactive element.
Most elements are non reactive to noble gases.
Potassium is most reactive with the element Oxygen. However, it should be noted that it is most reactive with a non-element: Water.
Potassium is the element that used to be first to make fertilizer.
Yes, fluorine is the most reactive element on the periodic table.
Metals are elements, such as Iron (an element) and Copper (also an element), and they react for various reasons.
Elements are more reactive as you go down the periodic table and to the left.
Hydrogen with 0.09 density
Iridium is the elemento with the highest density
Yes, americium is a reactive element.