Question

why metallic character goes on decreasing while going from left to right in a period ?

Answer 1

metallic character decreasing when going left to right because atomic radius increases and in p group non metallic or gases character is also increases

Answer 2

Metallic character decreases when we go from left to right because atomic radius of the element increases and its non metallic or gaseous characteristics also starts increasing as atoms more readily start to accept electrons to fill a valence shell than lose electrons to remove the unfilled shell.