Using the symbol of the previous noble gas to indicate the...

Using the symbol of the previous noble gas to indicate the core electrons, write the electron configuration for each of the following elements. $\begin{array}{ll}{\text { a. arsenic, } Z=33} & {\text { c. strontium, } Z=38} \\ {\text { b. titanium, } Z=22} & {\text { d. chlorine, } Z=17}\end{array}$

Using the symbol of the previous noble gas to indicate the core electrons, write the electron configuration for each of the following elements.
$\begin{array}{ll}{\text { a. arsenic, } Z=33} & {\text { c. strontium, } Z=38} \\ {\text { b. titanium, } Z=22} & {\text { d. chlorine, } Z=17}\end{array}$

Key Concepts

Periodic Table Trends

Periodic table trends refer to the regular variations in the properties of elements, such as the order of electron shell filling and the number of valence electrons, that result from the periodic arrangement of elements by their atomic number. These trends help predict and explain the electron configurations of elements based on their position in the periodic table.

Aufbau Principle

The Aufbau principle is the rule that electrons fill atomic orbitals in order of increasing energy. This principle, along with the Pauli exclusion principle and Hund's rule, guides the order in which subshells are filled, starting from the lowest energy level and moving upward through higher orbitals.

Electron Configuration

Electron configuration is the method of describing the distribution of electrons among the orbitals of an atom. It defines how electrons are arranged in various energy levels and subshells, following specific rules and principles, such as the Pauli exclusion principle and Hund's rule, to achieve the lowest possible energy state for the atom.

Noble Gas Core Notation

Noble gas core notation is a shorthand method for writing electron configurations that uses the electron configuration of the preceding noble gas to represent the core electrons. This simplification allows one to focus on the valence electrons that determine the chemical behavior of the element while compactly representing the complete electronic structure.

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