What tripositive ion has the electron configuration 3Kr4 4d3?

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Identify the electron configuration of Krypton (Kr), which is the noble gas preceding the element in question. The electron configuration of Kr is [Ar] 3d10 4s2 4p6.

Understand that the notation '3Kr4 4d3' suggests an electron configuration starting from Krypton, followed by additional electrons in the 4d orbital.

Recognize that the 'tripositive ion' indicates the element has lost three electrons. Therefore, the neutral atom would have three more electrons than the ion.

Determine the atomic number of the neutral atom by adding three electrons to the total number of electrons in Krypton (36) plus the electrons in the 4d orbital (3). This gives a total of 42 electrons for the neutral atom.

Use the periodic table to find the element with atomic number 42, which is Molybdenum (Mo). The tripositive ion of Molybdenum (Mo^3+) would then have the electron configuration [Kr] 4d3.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Electron Configuration

Electron configuration describes the distribution of electrons in an atom's orbitals. It is represented using a notation that indicates the energy levels and sublevels occupied by electrons. For example, '3Kr4 4d3' indicates that the ion has electrons filling up to the 4d subshell, which is crucial for determining the ion's chemical properties.

Tripositive Ion

A tripositive ion, or a cation with a +3 charge, is formed when an atom loses three electrons. This process affects the electron configuration and can significantly alter the atom's reactivity and bonding characteristics. Understanding how to derive the correct electron configuration for a tripositive ion is essential for identifying the element.

Transition Metals

Transition metals are elements found in the d-block of the periodic table, characterized by their ability to form variable oxidation states and complex ions. The electron configuration of transition metals often involves the d orbitals, which play a key role in their chemical behavior. Recognizing the properties of transition metals helps in identifying the specific tripositive ion in question.