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GROUP 2: ALKALINE EARTHS
The elements known commonly as alkaline earths have atoms with the (ns)2 design and almost always have the +2 oxidation state in their compounds. Molecules such as MgH may be detected at bigger temperatures in the gas phase, the instability of the +1 state under normal conditions being due to the much larger lattice energies obtained with M2+. Some data explaining the factors underlying group trends are defined. Beryllium is unique, as the polarizing and very small Be2+ ion builds compounds with more covalent character than with the other elements, where a bigger degree of ionic character is normal. Be gives some similarities both with its diagonal neighbor aluminum, and with the group 12 element zinc.
Magnesium and calcium are very abundant elements, being distinct in silicate minerals and occurring in major deposits of CaMg(CO3)2 (dolomite), CaCO3 and MgKCl3.3H2O (carnallite). Phosphate and calcium fluoride minerals are the major sources of the substance P and F, respectively.
In a potassium atom, electronic energy levels are in the following order: (1) 4s>3d (2) 4s>4p (3) 4s (4) 4s Ans: 4s
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Both of the MOs have the nodes of the original 2p orbitals, which merge into a one node because the nodal plane is common to both orbitals. The antibonding MO has in addition a
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What are Cell diagrams? Consider the galvanic cell depicted in Figure. This cell has a hydrogen electrode at the left and a silver-silver chloride electrode at the right. The h
A 10L helium balloon at a pressure of two bar at 27C. Some O 2 is now inside in balloon and final volume is made 30L. the pressure also fell to 1 bar at similar temperature. the p
Number of electrons in -CONH 2 is: (1) 22 (2) 24 (3) 20 (4)28 Ans:24
Explain Curie point and hystereris? An ordinary piece of iron generally has little or no net magnetic moment. Though, if it is placed in a strong enough external magnetic fie
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A tank containing 100 kg of a 60% brine (60% salt) is filled with a 10% salt solution at the rate of 10 kg/min and 78°F. Solution is removed from the tank at the rate of 15 kg/min.
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