You most likely think of water together a problem that deserve to put the end fires. But some facets are so reactive the they burn in water. In fact, they virtually explode in water. An example is shownin the picture below. Around 3 pounds of sodium were included to water, and also the an outcome was one explosive reaction. Why is salt such a reactive element? In this section, you will find out.

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Figure $$\PageIndex1$$: salt reacting through water.

## The very first Group

Sodium $$\left( \ceNa \right)$$ is an facet in group 1 the the regular table the the elements. This group (column) of the table is shown below. It consists of the nonmetal hydrogen $$\left( \ceH \right)$$ and six metals called alkali metals. Aspects in the same team of the routine table have the same number of valence electrons. These space the electrons in the outer energy level of the atom that deserve to be involved in smashville247.netical reactions. Valence electrons determine countless of the nature of one element, so aspects in the same team have comparable properties. All the facets in group 1 have actually just one valence electron. This provides them an extremely reactive.

Figure $$\PageIndex2$$: team 1 that the periodic table.

## Reactivity of group 1 Elements

Hydrogen is a an extremely reactive gas, and also the alkali metals are even much more reactive. In fact, they space the most reactive steels and, together with the facets in group 17, are the most reactive of all elements. The reactivity that alkali metals increases from the height to the bottom the the group, so lithium $$\left( \ceLi \right)$$ is the the very least reactive alkali metal and francium $$\left( \ceFr \right)$$ is the most reactive. Since alkali metals are for this reason reactive, they are found in nature just in mix with other elements. They often combine with team 17 elements, i beg your pardon are really "eager" to get an electron.

## Other properties of Alkali Metals

Besides being an extremely reactive, alkali steels share a variety of other properties:

Alkali metals are every solids in ~ room temperature. Alkali steels are short in density, and also some of castle float on water. Alkali steels are fairly soft. Some are also soft sufficient to reduced with a knife, like the salt 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 atom of every elements. Pure hydrogen is a colorless, odorless, tasteless gas that is nontoxic but highly flammable. Hydrogen gas exists mainly as diatomic ("two-atom") molecules $$\left( \ceH_2 \right)$$, as displayed above. Hydrogen is the many abundant facet in the universe and the 3rd most abundant facet on Earth, and also occurs greatly in compound such together water.what are the most reactive elements on the periodic table