With the help of Appendix B, list the symbols for the first five elements, by atomic number, tha

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With the help of Appendix B, list the symbols for the first...

With the help of Appendix $\mathrm{B}$, list the symbols for the first five elements, by atomic number, that have an unpaired electron in an $s$ orbital. Identify the group in which most of these are found in the periodic table.

Key Concepts

Electron Configuration

This concept focuses on the arrangement of electrons within an atom's orbitals using principles such as the Aufbau principle and Pauli’s exclusion principle. It explains how an electron's presence in an orbital, especially the s orbital, can either be paired or unpaired, which is critical for determining an element's chemical properties.

Unpaired Electrons in s Orbitals

An unpaired electron in an s orbital indicates that the orbital is only half-filled, as s orbitals can accommodate up to two electrons. This property influences the chemical reactivity and magnetic characteristics of the element since unpaired electrons can participate in bonding and reaction mechanisms.

Periodic Table Organization

The periodic table arranges elements based on increasing atomic number and recurring chemical properties. Groups or columns represent elements with similar valence electron configurations, which in turn affect their chemical behavior. Understanding the grouping helps in predicting trends and similarities among elements.

Alkali Metals

Alkali metals, found in Group 1 of the periodic table, are characterized by having a single electron in their outermost s orbital. This configuration gives them high reactivity and similar chemical properties. The question identifies that most elements with an unpaired electron in an s orbital belong to this group.

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