Final answer:
Element 119 would be placed in the alkali metal group (Group 1) and the 8th period of the modern periodic table, expected to exhibit typical alkali metal properties with unique characteristics due to relativistic effects.
Step-by-step explanation:
If element 119 is discovered, it would be placed on the modern periodic table in the alkali metal group, which is Group 1. This prediction is based on the fact that its a direct continuation of the trend within the periodic table, where each new period begins with an alkali metal. Element 119 would have the atomic number 119 and would be part of the 8th period of the periodic table. As with other superheavy elements, this element is expected to be highly unstable due to the sheer number of protons in its nucleus, leading to quick decay, as seen with other elements such as Oganesson (element 118).
Based on the periodic law, which states that elements show recurring patterns ('periodicity') of properties when they are arranged by increasing atomic number, element 119 would be expected to have properties similar to those of other alkali metals but also exhibit some unique characteristics due to the effects of relativistic electrons. Additionally, it belongs to a group of elements referred to as 'superheavy elements', which exhibit different properties due to their large atomic masses and have potential positions in the theoretical 'island of stability' where more stable superheavy elements might exist.