How does the metallic and non-metalic character vary on moving from left to right in a period?

Explanation

On moving from left to right in a period the number of valence electronic increases by one at each succeeding element but the number of shells remains the same .As a result the nuclear charge increases and the tendency of the element of lose electrons decreases and hence the metallic character decreases as we move from left to right in a period . conversely ,as the nuclear charge increase the tendency of the element to gain element increases and hence the non- metallic increases from left to ritght in a period.
Alternatively metallic character decreases and non- metallic character increases as we move from left to right in a period. It is due to increases in ionization enthalpy and negative electron gain enthaply.