Periodic trends are useful for understanding chemical reactivity from "summary" of The Periodic Table: A Very Short Introduction by Eric R. Scerri
Periodic trends play a crucial role in helping us comprehend the reactivity of different chemical elements. By observing these trends, we can gain valuable insights into how certain elements are likely to interact with others in various chemical reactions. This knowledge is essential for predicting the behavior of elements and compounds in a wide range of scenarios. One of the most significant periodic trends is the periodicity of the atomic radius. As we move across a period from left to right, the atomic radius generally decreases. This trend is due to the increasing number of protons in the nucleus, which exerts a greater pull on the electrons in the outermost shell. Conversely, as we move down a group, the atomic radius tends to increase. This is because the outermost electrons are in higher energy levels, farther away from the nucleus. The electronegativity of an element is another important periodic trend. Electronegativity is a measure of an element's ability to attract electrons in a chemical bond. Elements with higher electronegativity values tend to attract ...
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