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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.
The fresh feed to an ammonia production process contains nitrogen (N 2 ) and hydrogen (H 2 ) in stoichiometric proportion, along with an inert gas (I). The feed is combined with
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The number of electrons and neutrons of an element is 18 and 20 respectively. Its mass number is: (1) 17 (2) 37 (3)2 (4)38 Ans: 17
The following cell is used for measuring the partial pressure of oxygen at 700 o C. (Pt) Cu 2 Cu 2 0 / 0.85 ZrO 2 - 0.l5 CaO / O 2 (Pt) Knowing that conduction through the
Threshing The process of threshing separates the kernels from the stalks or panicles on which they grow. Threshing may take place in the field, or at the homestead or village;
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