Question

The following properties are observed for an unknown element. Identify the element from its properties. (a) The neutral atom has two unpaired electrons. (b) One of the valence electrons in the ground-state atom has m_l = +1. (c) The most common oxidation state is +4. (d) If an electron in a hydrogen atom were excited to the same principal quantum level, n, as the valence electrons in an atom of this element, and fell to the n - 1 quantum level, the photon emitted would have the energy of 4.9 x 10^{-20 J.}

^{Please explain your answer. I already have the answer but I need to understand how to use this information on a test.}

Answer 1

en em and - 1 hanin 4e n SP mic numbe

Comment in case of any doubt.