Consider the molecule BF₃. (a) What is the electron configuration of an isolated B atom? (b) What is the electron configuration of an isolated F atom?

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To determine the electron configuration of an isolated B (Boron) atom, first identify its atomic number, which is 5. This means a neutral Boron atom has 5 electrons.

Write the electron configuration for Boron by filling the orbitals in order of increasing energy: 1s, 2s, 2p. The configuration is:

{1s}^{2} {2s}^{2} {2p}^{1}

Next, consider the isolated F (Fluorine) atom. Its atomic number is 9, indicating it has 9 electrons.

Write the electron configuration for Fluorine by filling the orbitals in order of increasing energy: 1s, 2s, 2p. The configuration is:

{1s}^{2} {2s}^{2} {2p}^{5}

These configurations show how electrons are distributed in the atomic orbitals of Boron and Fluorine, which is essential for understanding their chemical behavior and bonding in molecules like BF₃.

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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, the electron configuration of a neutral boron (B) atom, which has 5 electrons, is 1s² 2s² 2p¹, while fluorine (F), with 9 electrons, has the configuration 1s² 2s² 2p⁵.

Atomic Structure

The atomic structure refers to the arrangement of protons, neutrons, and electrons within an atom. The nucleus contains protons and neutrons, while electrons orbit the nucleus in defined energy levels. Understanding atomic structure is essential for determining electron configurations, as it helps explain how electrons fill available orbitals based on energy levels and the principles of quantum mechanics.

Periodic Table Trends

The periodic table organizes elements based on their atomic number and electron configurations, revealing trends in properties such as electronegativity, ionization energy, and atomic radius. Elements in the same group often exhibit similar electron configurations in their outer shells, which influences their chemical behavior. For instance, boron and fluorine are in different groups, leading to distinct electron configurations and reactivity patterns.

Consider the molecule BF3. (a) What is the electron configuration of an isolated B atom? (b) What is the electron configuration of an isolated F atom?