Suppose in a different universe where the magnetic quantum number ml could only equal to 1.
How would it affect the periodic table?
What elements would then be equal to the noble gases in our universe?
In case if the value of the magnetic quantum number is 1, then np, nd, nf energy levels have always consisted of one orbital and a maximum occupancy of orbital electrons equals two. This led to the fact that the periodic system consisted of only 4 groups, as orbital external energy levels of elements in this group elements, amount to two electrons. Equivalents of noble gases of our universe were the following elements: He, C, Si, Ge, Sn, Pb