Electron configurations and sizes

Indicate the position of carbon in Mendeleev s periodic table of the elements, the electron configuration and size of its atom, and its oxidation states. 

Indicate the position of the alkali metals in Mendeleev s periodic table of the elements, the electron configurations and sizes of their atoms, and their oxidation states. Which of the alkali metals forms more stable diatomic molecules in their vapours Which compounds of the alkali metals are encountered in nature How are these metals prepared in a free state ... 

Indicate the position of the rare-earth elements in Mendeleev s periodic table, the electron configurations and sizes of their atoms, and their oxidation states. 

Types of Chemical Bonds electronegativity Bond Polarity and Dipole Moments Ions Electron Configurations and Sizes Predicting Formulas of Ionic Compounds Sizes of Ions... 

The first synthetic molecular sieves were zeolites with only alumimun and silicon as tetrahedrally coordinated cations. However, several other elements of similar electronic configuration and size can be substituted either for aluminum or silicon. 

The crystal structure of a solid is determined by forces acting between its various components. These forces may be of the ionic, covalent, metallic or Van der Waals type. The relative strength of each contribution depends upon the position of the elements within the Periodic Table, i.e. upon their valence electron configuration and size. The higher the principal quantum number of the valence electrons, the less important is the specific character of the valence electrons and the structures then are mainly determined by the size and the radius ratio of the elements. 

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