Use the periodic table to write an electron configuration for each element. Represent core electrons with the symbol of the previous noble gas in brackets. c. Nb

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Identify the atomic number of niobium (Nb) from the periodic table, which is 41.

Determine the previous noble gas before niobium, which is krypton (Kr) with an atomic number of 36.

Write the electron configuration starting with the noble gas core: [Kr].

Continue the electron configuration from krypton by adding the electrons in the 5th period: 5s^2.

Add the remaining electrons in the 4d subshell: 4d^3, resulting in the full electron configuration: [Kr] 5s^2 4d^3.

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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 typically written in a specific format that indicates the energy levels and sublevels occupied by electrons. For example, the configuration for an element can be expressed as a series of numbers and letters, such as 1s² 2s² 2p⁶, which represent the number of electrons in each subshell.

Noble Gas Notation

Noble gas notation is a shorthand method for writing electron configurations by using the symbol of the nearest preceding noble gas to represent core electrons. This simplifies the notation by omitting the inner electron configurations, allowing for a more concise representation. For instance, for elements beyond neon (Ne), one might start with [Ne] to indicate the electron configuration of neon before detailing the additional electrons.

Periodic Table and Element Position

The periodic table organizes elements based on their atomic number and electron configurations, which reflect their chemical properties. The position of an element in the table helps predict its electron configuration, as elements in the same group often have similar configurations. For example, niobium (Nb) is located in group 5 and period 5, which influences its electron arrangement and helps in determining its configuration.

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