Use the periodic table to determine each quantity. c. the number of 4p electrons in Br

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Identify the atomic number of Bromine (Br) from the periodic table. The atomic number represents the number of protons and, in a neutral atom, the number of electrons.

Locate Bromine in the periodic table and determine its electron configuration or use a general rule to find the electron configuration. Bromine is in the 4th period and group 17.

Write out the electron configuration for Bromine. The electron configuration is built by adding electrons to the lowest available energy sublevels first (Aufbau principle), following the Pauli exclusion principle and Hund's rule.

Identify the 4p sublevel in the electron configuration of Bromine. The 4p sublevel is part of the fourth energy level (n=4).

Count the number of electrons in the 4p sublevel to find the number of 4p electrons in a Bromine atom.

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Key Concepts

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

Periodic Table

The periodic table is an organized chart of all known chemical elements, arranged by increasing atomic number. Each element's position reveals its electron configuration, which is crucial for understanding its chemical properties. The table is divided into blocks (s, p, d, f) that indicate the type of orbitals being filled with electrons.

Electron Configuration

Electron configuration describes the distribution of electrons in an atom's orbitals. For bromine (Br), which has an atomic number of 35, the electron configuration is [Ar] 4s² 3d¹⁰ 4p⁵. This notation shows how many electrons occupy each energy level and sublevel, helping to identify the number of electrons in specific orbitals, such as the 4p subshell.

Subshells and Orbitals

Subshells are divisions of electron shells that contain orbitals, where electrons are likely to be found. The 'p' subshell can hold a maximum of six electrons and consists of three orbitals. In the case of bromine, the 4p subshell contains five electrons, which are crucial for understanding its reactivity and bonding behavior.

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