ELECTRONIC CONFIGURATION

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For more information: • http://www.7activestudio.com • [email protected] • http://www.7activemedical.com/ • [email protected] • http://www.sciencetuts.com/ • [email protected] • Contact: +91- 9700061777, • 040-64501777 / 65864777 • • 7 Active Technology Solutions Pvt.Ltd. is an educational 3D digital content provider for K-12. We also customise the content as per your requirement for companies platform providers colleges etc . 7 Active driving force The Joy of Happy Learning -- is what makes difference from other digital content providers. We consider Student needs, Lecturer needs and College needs in designing the 3D 2D Animated Video Lectures. We are carrying a huge 3D Digital Library ready to use. • • ELECTRONIC CONFIGURATION:General Electronic configuration:They are S block elements as last electron enters in S-sub shell.Group 1A atoms are the largest in their horizontal periods in the periodic table. When the outermost electron is removed to give a positive ion, the size decreases considerably. There are two reasons for this i The positive charge on the nucleus is now acting on lesser number of electrons, i.e., attraction increases which brings contraction in size.ii Atomic as well as ionic size increases from Lithium to Francium due to the presence of one extra shell of electrons. • IONISATION ENTHALPY:Due to their large size, the outermost electron is far from the nucleus and can easily be removed. Their ionization energies or ionization enthalpies are relatively low. Thus, the metals have a great tendency to lose the electron to change into ions. These metals are highly electropositive in nature. As the ionization enthalpy decreases from Lithium to Caesium, the electropositive character increases, i.e., metallic character increases. The reactivity of these metals increases from Lithium to Caesium. • DENSITY:The densities of alkali metals are quite low as compared to other metals. Lithium, Sodium and Potassium are lighter than water.On moving from Lithium to Caesium, density of alkali metals increases however density of Potassium is less than Sodium. Exception • Explanation:Low densities of alkali metals are due to their large atomic radii. Also due to large atomic size, their atoms are less closely packed in their crystal lattice. • On moving down, both atomic mass and atomic volume increase but increase in atomic volume can't compensate increase in atomic mass. Exceptionally the lower density of Potassium than Sodium is due to abnormal increase in size of Potassium.

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