Question

What are the common physical and chemical features of alkali metals?​

Answer 1

Answer:

Physical properties:-

1.alkali metals are soft , light and silvery white metal.

2.their densities are low (because of the large size ).it increases moving down the group. However, potassium is lighter than sodium.

3.the melting and boiling points of alkali metal are low because of the weak metallic bonding due to presence of one electron in valance shell.

Chemical properties:-

1. Reactivity towards air :the alkali metal tarnish in dry air due to the formation of their oxides. Lithium form monoxide, sodium peroxide and potassium and other metal form superoxide.

4Li + O2 --> Li2O

2Na + O2--->Na2O2

K + O2 ---> KO2

2.reactivity towards water : the alkali metals reacts with water and form hydroxide and release hydrogen gas. e.g., 2M + 2H2O -->2MOH + H2↑ { where M is alkali metals}

3. Reactivity towards halogens :alkali metals readily react with halogens to form ionic compound. e.g., 2M + X2 ---> 2MX

Where { X is halogens }

Explanation:

Answer 2

The alkali metals are a group of chemical elements in the periodic table with the following physical and chemical properties:

The alkali metals are a group of chemical elements in the periodic table with the following physical and chemical properties:shiny.

The alkali metals are a group of chemical elements in the periodic table with the following physical and chemical properties:shiny.soft.

The alkali metals are a group of chemical elements in the periodic table with the following physical and chemical properties:shiny.soft.silvery.

The alkali metals are a group of chemical elements in the periodic table with the following physical and chemical properties:shiny.soft.silvery.highly reactive at standard temperature and pressure.

The alkali metals are a group of chemical elements in the periodic table with the following physical and chemical properties:shiny.soft.silvery.highly reactive at standard temperature and pressure.readily lose their outermost electron to form cations with a charge of +1.

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