Summary Air pollution is the invisible enemy around us. It may not always be seen, but its effects are deeply felt—in our lungs, in our environment, and in the climate. From the smoke curling out of factory chimneys to the exhaust from cars stuck in traffic, human activities are a major source of air pollution. Nature also plays a role, like in volcanic eruptions or dust storms. But it’s the growing load from industries, vehicles, and agriculture that’s pushing the limits of what our air can handle. This article explores what air pollution is, the different sources—both natural and man-made—and how it affects our health and the environment. It also offers simple steps we can all take to help clean the air around us. Whether you’re a student, a teacher, or just someone who cares about the planet, this guide will help you understand why clean air matters more than ever. Introduction to Air Pollution Air is vital to life. We breathe it every moment without even thinking about i...
Modern Periodic Table and Its Salient Features Introduction The periodic table is the most powerful tool in chemistry, systematically organizing all known elements based on their atomic number and properties. It helps scientists predict element behavior, reactivity, and trends. The Modern Periodic Law , proposed by Henry Moseley in 1913 , states: "The physical and chemical properties of elements are periodic functions of their atomic numbers." This means elements with similar properties appear at regular intervals. The periodic table is structured into periods (rows) and groups (columns), forming a logical arrangement of elements. For a deeper understanding of the periodic table’s structure, check out our detailed article: Exploring Periodic Table Structure . Historical Background of the Periodic Table 1. Dobereiner’s Triads (1817) Johann Wolfgang Döbereiner grouped elements into triads based on atomic masses, but this system was limited to only a few elements. ...