Question

what are alkali metals?

Answer 1

Hey mate here is your answer

the alkali metal are six chemical elements in group 1. They are lithium,sodium, potassium, rubidium, cesium, francium. These metals are highly reactive in air and water.

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Answer 2

hello friend,

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Here is the answer

The alkali metals are a group (column) in the periodic table consisting of the chemical elements 
lithium (Li), 
sodium (Na), 
potassium (K), 
rubidiuim (Rb), 
caesium (Cs), and 
francium (Fr).
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This group lies in the s-block of the periodic table of elements as all alkali metals have their outermost electron in an s-orbital: this shared electron configuration results in their having very similar characteristic properties. Indeed, the alkali metals provide the best example of group trends in properties in the periodic table, with elements exhibiting well-characterised homologousbehaviour.

*PROPERTIES

The alkali metals are more similar to each other than the elements in any other group are to each other. Indeed, the similarity is so great that it is quite difficult to separate potassium, rubidium, and caesium, due to their similar ionic radii; lithium and sodium are more distinct. For instance, when moving down the table, all known alkali metals show increasing atomic radius, decreasing electronegativity,increasing reactivity, and decreasing melting and boiling points  as well as heats of fusion and vaporisation. In general, their densities increase when moving down the table, with the exception that potassium is less dense than sodium. One of the very few properties of the alkali metals that does not display a very smooth trend is their reduction potentials: lithium's value is anomalous, being more negative than the others.This is because the Li+ ion has a very high hydration energy in the gas phase: though the lithium ion disrupts the structure of water significantly, causing a higher change in entropy, this high hydration energy is enough to make the reduction potentials indicate it as being the most electropositive alkali metal, despite the difficulty of ionising it in the gas phase

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