You most likely think the water as a problem that can put the end fires. Yet some facets are for this reason reactive the they burn in water. In fact, they basically explode in water. An instance is shownin the photo below. Around 3 pounds of sodium were added to water, and the an outcome was an explosive reaction. Why is salt such a reactive element? In this section, friend will find out.

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Figure \(\PageIndex1\): sodium reacting through water.

The an initial Group

Sodium \(\left( \ceNa \right)\) is an element in group 1 that the regular table the the elements. This team (column) that the table is shown below. It has the nonmetal hydrogen \(\left( \ceH \right)\) and six metals dubbed alkali metals. Aspects in the same group of the regular table have actually the same number of valence electrons. These are the electron in the outer power level that the atoms that have the right to be involved in cg-tower.comical reactions. Valence electrons determine countless of the nature of one element, so facets in the same team have similar properties. Every the facets in group 1 have just one valence electron. This renders them very reactive.

Figure \(\PageIndex2\): group 1 of the routine table.

Reactivity of group 1 Elements

Hydrogen is a an extremely reactive gas, and the alkali steels are even much more reactive. In fact, they are the many reactive steels and, along with the facets in group 17, room the many reactive of all elements. The reactivity of alkali metals increases from the height to the bottom that the group, for this reason lithium \(\left( \ceLi \right)\) is the the very least reactive alkali metal and also francium \(\left( \ceFr \right)\) is the many reactive. Since alkali metals are for this reason reactive, they are found in nature only in mix with various other elements. They often integrate with group 17 elements, i m sorry are very "eager" to acquire an electron.

Other properties of Alkali Metals

Besides being an extremely reactive, alkali metals share a number of other properties:

Alkali steels are every solids at room temperature. Alkali metals are short in density, and also some of lock float on water. Alkali steels are fairly soft. Part are even soft enough to reduced with a knife, favor the sodium pictured in the figure below.

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api/deki/files/78133/CK12_Screenshot_6-9-4.png?revision=1&size=bestfit&width=406&height=238" />Figure \(\PageIndex4\): Hydrogen has the smallest, lightest atoms of every elements. Pure hydrogen is a colorless, odorless, tasteless gas the is nontoxic but highly flammable. Hydrogen gas exists mainly as diatomic ("two-atom") molecule \(\left( \ceH_2 \right)\), as presented above. Hydrogen is the many abundant facet in the universe and also the 3rd most abundant aspect on Earth, and also occurs largely in compound such together water.alkali metals have how many valence electrons