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Curated by: Khan Academy India - English (4 videos)
In this video, we look at how the sea of electron theory can explain the characteristic physical properties of the d block elements (transition elements). We then explore how melting point varies in the 3d series, look at the limitations of sea of electron theory and how variation can be explained using band theory. Finally we see how melting point varies down the group and ultimately tungsten becomes the metal with the highest melting point amongst all metals! Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now! https://www.khanacademy.org/science/class-12-chemistry-india/x6a5fb67b43bb54b9:the-d-block-elements?lang=en Timestamps: 0:00 Introduction 00:18 Physical properties of d block metals 01:36 Variation in melting point of metals in the periodic table 2:38 Variation in melting point in 3d series of d block 3:28 Sea of electron theory vs Band Theory 5:40 Band filling across 3d series and effect on metallic bonding 6:42 Why Manganese has a lower than expected melting point ? 8:34 Variation in melting point in 4d and 5d series 8:56 Why melting point increases from down the group in d-block 9:49 Tungsten has the highest melting point amongst all metals! Khan Academy India is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We have videos and exercises that have been translated into multiple Indian languages, and 15 million people around the globe learn on Khan Academy every month. Support Us: https://india.khanacademy.org/donate Created by Khan Academy