Halogensand Noble Gases
Groupsin the periodic table refer to the families in which elements withsimilar characteristics are displayed .in the given context I chosenoble gases and halogens which are placed just next to each other asgroup 18 and 17 respectively. This implies that elements with thesame chemical and physical properties fit in the same family.
Presentedas group 17, halogen consists of chlorine, bromine and iodineelements. Halogens are highly reactive and they exist inform ofmolecules that usually bond covalently. During reaction, theseelements produce vapor that is usually colored. Chlorine forms greenvapor, bromine forms a red vapor whereas iodine produces purplevapor. Additionally, halogens have weak intermolecular forces and asa result, they have low boiling and melting points. Elements in thisgroup easily form compounds. For instance, when chlorine reacts withsodium the resulting compound is sodium chloride. Similarly, brominereaction with sodium will lead to the formation of sodium bromide.
Noblegases occur as group 18 in the periodic table. This group is made upof radon, xenon, krypton, neon and helium. Notable features that makeelements in this group similar are their inability to react,resistance to form compounds and their colorless odorless nature. Itshould be noted that noble gases will display these characteristicsunder standard conditions. Moreover these elements n awfully highpotential for ionization .their oxidation number of 0 prevents theseelements from readily reacting. This means that they are inert andare therefore suitable in applications where reactions are notneeded.
Thefictitious element in this case is metal B,which has an atomic mass of 26.the atomic structure of this elementis thus 126.96.36.199. The outer shell of element Bis already full and therefore the element has a valency of 0 makingit unable to react. Therefore, this element fits in the group ofnoble gases.
Paul,P. Theperiodic table: A visual guide to the elements.Quercus publishers,2014