The next animation shows this list of known elements moving into position to form Mendeleev's first periodic table of Feb., 1869. One can see that he made some mistakes - beryllium and magnesium should be moved down to a position underneath lithium and sodium, and he has the rare earths out of place (mostly the trouble was that their atomic weights hadn't been accurately measured yet).On thinglink.com, edit images, videos and 360 photos in one place. Explore content created by others. Periodic Trends. Reactivity of Alkali Metals Video. Flash Video on Atomic and Ionic Radii. Summary of Periodic Trends. Ionization Energy and Periodic Trends: http://www.mikeblaber.org/oldwine/chm1045/notes/Periodic/Ionize/Period04.htm. http://www.chemguide.co.uk/atoms/properties/ies.html. Bonding and Solids . Metals: Simulation. Video – Dissociation of a Salt
Periodic Trends in Ionization Energy ; Ionization energy decreases down a group. This means that the outermost electron is more readily removed as we go down a group. As the atom gets bigger, it becomes easier to remove an electron from the most spatially extended orbital. Ionization energy generally increases across a period. [3.2A Periodicity: Trends in the Periodic Table] pg. 1 of 4 CURRICULUM A. A covalent bond is formed by the electrostatic attraction between a shared pair of electrons and the positively charged nuclei. B. Single, double, and triple covalent bonds involve one, two, and three shared pairs of electrons respectively.
KS3 Chemistry Atoms, elements and the periodic table learning resources for adults, children, parents and teachers.
2.2 The Periodic Law. 2.2.1 Finding the "Missing Elements" 2.2.2 Designing Your Own Periodic Table 2.2.3 Family Characteristics 2.2.4 Trends Within Families For the Teacher (Discussion and Answer Keys for Activities 2.2.1-2.2.4) Applications to Everyday Life. 2.3 Diffusion and Osmosis. 2.3.1 Brownian Motion 2.3.2 Diffusion of Gases