The main group elements complete their elctron configuration using s and p electrons in the periodic table. These elements range from the most metallic to the most non-metallic , with intermiediate properties of semi-metals, in between . The elements which occur at the two extremes of the periodic table are highly reactive and therefore , these highly reactive elements do not occur in free state, they usually occur in the combined forms.
Select the correct statement.

Options

A. Chemical reactively of the elements is generally less in the centre of a period.
B. Most of the elements forming amphoteric oxides are placed in the centre of a period.
C. Metallic character increases with increasing atomic number in a group where as decrease form left to right in a period.
D. All of these

Answer

D