Write the full electron configuration (1 s^2 2 s^2,. etc.) for each of the following elements.

step 1 Before we move into an extra question, you should go about what is mean by the electron configur

Write the full electron configuration (1 s^2 2 s^2,. etc.)...

Write the full electron configuration $\left(1 s^{2} 2 s^{2},\right.$ etc.) for each of the following elements.
$$
\begin{array}{l}{\text { a. strontium, } Z=38} \\ {\text { b. zinc, } Z=30} \\ {\text { c. helium, } Z=2} \\ {\text { d. bromine, } Z=35}\end{array}
$$

Key Concepts

Aufbau Principle

The Aufbau principle states that electrons occupy the lowest energy orbitals available before filling higher energy ones. This principle provides the order in which the orbitals are filled, which is reflected in the written electron configuration of an atom.

Electron Configuration

Electron configuration describes the arrangement of electrons in an atom’s orbitals. It provides a systematic way to account for the number of electrons placed in different energy levels and subshells, and it is crucial for understanding chemical behavior, bonding, and periodic trends.

Atomic Orbitals and Subshells

Atomic orbitals are regions around the nucleus where electrons are likely to be found. These orbitals are grouped into subshells (such as s, p, d, and f), each with a specific shape and capacity. Understanding the organization of orbitals and their notation is essential for writing out a full electron configuration.

Pauli Exclusion Principle

The Pauli exclusion principle asserts that no two electrons in an atom can have the same set of four quantum numbers. This means each orbital can hold a maximum of two electrons with opposite spins, thereby limiting electron occupancy and influencing electron configuration.

Hund's Rule

Hund's rule dictates that when filling degenerate orbitals (orbitals with the same energy level), electrons will occupy them singly with parallel spins before any pairing occurs. This minimizes electron-electron repulsions and stabilizes the atom’s configuration.

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