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Periodicity three :Trend in the physical properties of the alkaline earth metals.
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Group II - The Alkaline Earth Metals. (Variation in Physical Properties) Beryllium (Be) (Atomic number = 4) 1s2 2s2 Magnesium (Mg) (Atomic number =12) 1s2 2s2 2p6 3s2 Calcium (Ca) (atomic number = 20) 1s2 2s2 2p6 3s2 3p6 4s2 Strontium (Sr) (Atomic number = 38) 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 5s2 Barium (Ba) (Atomic number = 56) 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 6s2 Notice that each alkaline earth metal has two electrons in its outermost shell and that these electrons occupy s orbitals. 1) Trends in the physical properties of the alkaline earth metals. a) The trend in atomic radius The graph below shows the trend in atomic radius for the alkaline earth metals. Notice that as the atomic number increases the size of the atoms also increase. In other words as group two is descended, atomic radius increases Why is this? Look closely at the electronic structures of each element provided for...
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