Question

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

Answer 1

this is occur because after moving left to right in a period the tendency of electron loosing power goes on decreases so electropositivity nature of element decreases and electronegativity increases so the metallic character of element decreases after moving left to right in a period

Answer 2

yes metallic character decrease across a period from left to right
DOMINATING FACTOR ~Effective nuclear charge