Question

What is the electron configuration of an element with atomic number 109?

Answer 1

`[Rn]5f^14\6d^7\7s^2\`

Explanation:

Element `109` is called meitnerium. It has `109` electrons in a neutral atom of it, and has an electron configuration of `[Rn]5f^14\6d^7\7s^2\`.

Source:

http://www.rsc.org/periodic-table/element/109/meitnerium