Multiple-site search is loading. Shell structure: 2.8.18.12.1. 4 years ago. A valence electron is an outer shell electron and may participate in the formation of a chemical bond. Why is the electronic configuration of Niobium [Kr] 4d4 5s1? Ok but how many valence electrons does an atom of Niobium have? A vertical column in the periodic table. Githy.com. Everyone, feel free to correct me in the comments! The first known exception to occur in the periodic table is in period 5: niobium’s ground state electronic configuration is $\ce{Nb: [Kr] 5s^1 4d^4}$ which is not warranted by the “usual” rules for determining electronic configuration. Includes Concise Form of Electron Configuration Notation and Niobium (Nb). The Noble Gas Configuration is the preferred configuration for the arrangement of electrons on all atoms. Symbol: Nb . The number of electrons in each element’s electron shells, particularly the outermost valence shell, is the primary factor in determining its chemical bonding behavior. So, the “half-full rule” is not sufficient in periods 5 and higher. It has 39 electrons and ends in a d orbital. Atomic weight: 92.90638. Each element has a unique atomic structure that is influenced by its electronic configuration, which is the distribution of electrons across different orbitals of an atom. Name: niobium . In the case of Niobium the valence electrons is 2,3,5. Source(s): https://shrinke.im/a7Yqz. Ground state electron configuration: [Kr]4d4 5s1 . Let me first prefix this answer with a disclaimer: Transition metal chemistry is not my area of expertise and I'm quite rocky on this so some of the reasoning may be a bit wonky. What is the electron configuration of niobium 2 plus? For example, niobium (Nb, atomic number 41) is predicted to have the electron configuration [Kr]5s 2 4d 3. Period A horizontal row in the periodic table. Source(s): https://shrinks.im/a9A9d. Atomic number: 41 . The atomic number of each element increases by one, reading from left to right. Electron Configuration Chart for All Elements in the Periodic Table. 0 0. sazid. Lv 4. The full electron configuration for Nb is : {eq}1s^2 2s^2 2p^6 3s^2 3p^6 3d^{10} 4s^2 4p^6 4d^4 5s^1{/eq} The closest noble gas is Kr which has a configuration of: The chemical element with the atomic number 41 is niobium; the electron configuration is:[Kr]4d4.5s1. Members of a group typically have similar properties and electron configurations in their outer shell. Experimentally, we observe that its ground-state electron configuration is actually [Kr]5 s 1 4 d 4 . Possible oxidation states are +3,5. I know that an electron will move from the ns orbital to the (n-1)d orbital because of the half-filled and fully-filled ones having extra stability, but 4d4 is neither half-filled nor fully-filled. 4 years ago. 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