What is true of elements in a period on the periodic table? . (points : 3). they have different properties that repeat across the next period.. they have similar properties that repeat across the next period.. they have similar names.. they have different properties that show no pattern.

Elements that belong to the same period which is seen horizontally in the periodic table have different properties. Elements with similar properties are seen in columns or groups. Elements in the same period have similar principal quantum number and belong to the same principal shell. Hence the answer is that they have different properties that repeat across the next period. 

They are like other investigations? say there was a murder u have to do blood test and finger prints which run through a lab. 

Must be negative.substance increases