Question

What properties do the halogens have in common?

   What properties do the halogens have in common?

Chemistry

Thomas Myers,Keith… 1st Edition

Chapter 4, Problem 3

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Solved by Expert Zachary Papazian

07/23/2020

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What properties do the halogens have in common?

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Key Concepts

Group Trends in the Periodic Table

The halogens are elements in Group 17, meaning they share a common position in the periodic table, and thus many periodic trends such as a decrease in electronegativity and reactivity down the group due to increasing atomic size and electron shielding.

Electron Configuration

All halogens have seven electrons in their outermost shell (ns2 np5 configuration), which makes them one electron short of a stable octet. This electron configuration is central to their high reactivity and their tendency to form negative ions.

High Electronegativity and Reactivity

Halogens are among the most electronegative elements. Their strong tendency to attract electrons leads them to act as potent oxidizing agents and to readily participate in chemical reactions, often forming salts with metals.

Formation of Diatomic Molecules

In their elemental forms, halogens exist as diatomic molecules (e.g., F2, Cl2) because pairing up allows them to achieve a more stable electron configuration, reflecting their intrinsic desire to complete an octet.

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