Views: 38
Physical Properties of S-Block Elements
It is observed that the physical and chemical properties of these s block elements change in a particular trend as the atomic number of the elements increases.
All of the s-block elements are metals. In general, they are shiny, silvery, good conductors of heat and electricity and lose their valence electrons easily. In fact, they lose their s orbital valence electrons so easily that the s-block elements are considered to be some of the most reactive elements on the periodic table.
The elements in column 1, are known collectively as the alkali metals (except hydrogen). They always lose their one valence electron to make a +1 ion. These metals are characterized by being;
- Very soft.
- Not very dense, the density of the alkali metals increases down the group. Exception: the density of potassium is less than the density of sodium.
- Having a low melting and boiling point due to the weak metallic bonding.
- They react extremely vigorously with water and even oxygen to produce energy and flammable hydrogen gas.
Alkali metals and their respective salts have the capability to impart colour to the oxidizing flame due to the heat generated from the flame which excites the valence electrons from one energy level to another energy level. This helps in the detection of alkali metals during the flame test