Hot Student Stories

Find the atomic numbers of the as yet undiscovered next two members of the series. radon

Cynthia Baker

in Chemistry

1 answer

1 answer

Ashley Howard on December 1, 2018

This answer is based on the configuration of electrons.And you can use the rule of Aufbau order to predict the atomic number of the following items.Radon Rn is the element number 86.Following Aufbau rule, the electron configuration of Rn is: [Xe] 6s2 4f14 5d10 6p6. This means that you are assuming 2 + 14 + 10 + 6 = 32 electrons with respect to the element Xe.You can verify that the atomic number of Xe is 54, so that when you add 32 to get 54 + 32 = 86, which is the atomic number of Rn.De again, as for the Aufbau of the regulations, the following element of the same group or period is when the 6 electrons in the 7p orbitals are filled. For that, they have to spend of 32 elements, whose orbitals are:7s2 5f14 6d10 7p6: count electrons added: 2 + 14 + 10 + 6 = 32, and that is why the next item wil has atomic number 86 + 32 = 118.Now, when you are going for a new series to find a new type of orbital, g orbital, for which the model predict there are 18 electrons to fill.So the next item in the group have been ; 2 + 18 + 14 + 10 + 6 = 50 the electrons, which means that the atomic number of this, not yet discovered element, has atomic number 118 + 50 = 168.By the way in which the element with atomic number 118 was already discovdered their symbol is the Og. You can search information on the internet.Answers: 118 and 168.

Add you answer