Rubidium, caesium and francium. Potassium will generate enough heat to ignite the hydrogen produced in the reaction but the reaction is not really explosive.
alkali metals react violently in cold water
All metals, if they do react with water at all, react faster in steam than in water. However, the metals that react SLOWLY with cold water are the metals from Group-IIA(Magnesium, Calcium, etc).
It will react vigourisly
Gold does not react with water or steam. i wouldn't totally agree with the above statment. There are 5 metals which don't not just 1...these are: .lead .copper .mercury .silver .gold
Hot water. Metals become more malleable at greater temperatures.
Metals like copper, silver, and gold do not react with cold water because they are less reactive. This is due to their position in the reactivity series, where they do not displace hydrogen from water.
The Alkali metals (group 1) and the Alkali Earth metals (group 2) react violently with water. Lithium and magnesium show slow reactions in boiling water. Sodium and potassium reacts violently with flames with cool water. The elements in higher periods (strontium, barium etc.) react explosively.Elements in the 1st group react rapidly with cold water. The rate of reaction increases down the period. The elements in the 2nd group also reacts with hot water or steam.
Three metals that react with cold water are sodium, potassium, and lithium. These alkali metals react vigorously with water, producing hydrogen gas and corresponding hydroxides. Sodium reacts to form sodium hydroxide, while potassium reacts more violently, leading to the production of potassium hydroxide. Lithium reacts more slowly compared to the other two but still produces lithium hydroxide and hydrogen when in contact with cold water.
All of these metals react vigorously or even explosively with cold water. In each case, a solution of the metal hydroxide is produced together with hydrogen gas. This equation applies to any of these metals and water - just replace the X by the symbol you want. In each of the following descriptions, I am assuming a very small bit of the metal is dropped into water in a fairly large container.
Alkali metals, for example: 2Me + 2H2O = 2MeOH + H2 Me is the metal
Non-polar molecules like oils and fats do not have an affinity for water because they are hydrophobic, meaning they do not interact well with water molecules. This is due to their lack of electric charge and inability to form hydrogen bonds with water.
Francium is an extremely reactive element and would react violently with cold water, releasing a large amount of energy in the process. This would result in a rapid explosion due to the formation of hydrogen gas and the release of significant heat energy. Francium is so rare and radioactive that there are no known instances of it reacting with water.