Ncert Exercises & Solutions

Identify the group and valency of the element having atomic number 119. Also predict the outermost electronic configuration and write the general formula of its oxide.

The present set up of the Long form of the periodic table can accommodate maximum 118 elements. Thus, in accordance with aufbau principle, the filling of 8s-orbital will occur. In other words 119th electron will enter 8s-orbital. As such its outmost electronic configuration will be 8s¹.

Since, it has only one electron in the valence shell, i.e., 8s, therefore, its valency will be 1 and it will lie in the group IA along with alkali metals and the formula of its oxide will be M₂O where M repersents the element.

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