Question

Considering that there are 111 elements in the present periodic table, how many more elements are to be filled if an element with an electron entering into 'g' subshell has to be placed? What would be its atomic number? Predict the period to which it belongs.

Answer 1

Element with $Z=126\left[Og\right]8s^{2}8p^{1}6f^4$

$5g^1$ where [Og] is oganesson ( Z=118 Given, periodic table has 111 elements

⇒ 126-111 = 15

15 more elements are to be added to periodic table for obtaining an element with an electron entering into g subshell. It’s atomic number is Z= 126. It belongs to 8th period of periodic table (pre assumed).