Write the trend of atomic size and metallic character along a group and a period in the modern periodic table.

(N/A) Trend of atomic size:
Along a group: From top to bottom,the atomic size increases because a new shell is added in each subsequent element.
Along a period: From left to right,the atomic size decreases because the nuclear charge increases,which pulls the electrons closer to the nucleus.
Trend of metallic character:
Along a group: Metallic character increases from top to bottom because the tendency to lose electrons increases due to the increase in atomic size.
Along a period: Metallic character decreases from left to right because the tendency to lose electrons decreases as the effective nuclear charge increases.