You more than likely think of water as a substance that have the right to put out fires. But some elements are so reenergetic that they burn in water. In truth, they practically explode in water. An instance is shownin the photo below. About 3 pounds of sodium were added to water, and also the outcome was an explosive reactivity. Why is sodium such a reactive element? In this section, you will uncover out.

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Figure (PageIndex1): Sodium reacting through water.

The First Group

Sodium (left( ceNa ight)) is an aspect in group 1 of the routine table of the elements. This group (column) of the table is shown listed below. It consists of the nonsteel hydrogen (left( ceH ight)) and six steels called alkali metals. Elements in the very same group of the routine table have the very same number of valence electrons. These are the electrons in the external power level of the atoms that have the right to be involved in lutz-heilmann.infoical reactions. Valence electrons identify many type of of the properties of an aspect, so facets in the very same team have comparable properties. All the aspects in team 1 have simply one valence electron. This renders them very reactive.

Figure (PageIndex2): Group 1 of the routine table.

Retask of Group 1 Elements

Hydrogen is a really reenergetic gas, and also the alkali steels are even more reenergetic. In truth, they are the most reactive steels and also, together with the facets in team 17, are the many reenergetic of all aspects. The retask of alkali metals rises from the top to the bottom of the group, so lithium (left( ceLi ight)) is the leastern reenergetic alkali steel and also francium (left( ceFr ight)) is the many reenergetic. Due to the fact that alkali steels are so reactive, they are uncovered in nature just in combicountry through various other facets. They frequently combine via group 17 aspects, which are extremely "eager" to acquire an electron.

Other Properties of Alkali Metals

Besides being incredibly reactive, alkali metals share a variety of other properties:

Alkali steels are all solids at room temperature. Alkali metals are low in thickness, and some of them float on water. Alkali metals are fairly soft. Some are even soft sufficient to cut via a knife, favor the sodium pictured in the number listed 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 actually the smallest, lightest atoms of all aspects. Pure hydrogen is a colorless, odorless, tastemuch less gas that is nontoxic but extremely flammable. Hydrogen gas exists largely as diatomic ("two-atom") molecules (left( ceH_2 ight)), as shown above. Hydrogen is the the majority of numerous facet in the universe and also the 3rd most numerous facet on Earth, and also occurs largely in compounds such as water.why is francium the most reactive metal