Any of the group 1 metals, so lithium, sodium, potassium (you've probably seen these done at school), caesium and francium. That list is in order of reactivity from least to most. Though they are all pretty impressive!
Among many, Sodium. Potassium, even more so.
mixed metals group. (:
No, water has a neutral pH of 7.
alkaline metals
halogens or alkali metals
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.
The metals that react violently with cold water are group 1 and group 2 metals. Reactivity increases going down the group and to the left of a period.
Francium would react most violently with hydrochloric acid but all of them would react violently. Cesium and Rubidium would certainly react explosively. Potassium would be very violent and catch fire. Sodium would be quite violent.
K potassium reacts readily with Cl chlorine because the electron configuration changes to that of a noble gas. Group 7a would be the best guess.
Generally group 1 elements.
halogens or alkali metals
Group one elements react vigorously with water.They even react when exposed to air.For example lithium reacts violently with water.
Any of the alkali metals (in group one of the periodic table)
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.
It's in group one and therefore reacts violently with water
The metals that react violently with cold water are group 1 and group 2 metals. Reactivity increases going down the group and to the left of a period.
Francium would react most violently with hydrochloric acid but all of them would react violently. Cesium and Rubidium would certainly react explosively. Potassium would be very violent and catch fire. Sodium would be quite violent.
The 1st group elements i.e. Lithium,Sodium, Potassium, Rubidium, Cesium and Francium are all low density metals and they react violently with water.
It means that the substance in question will readily react with oxygen. Almost everything in group 1 of the periodic table will react violently with oxygen. exp. Sodium in powder from will ignite spontaneously when exposed to oxygen.
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