We have considered data available in the literature on the melting points and thermal stability of transition metal oxides (with different degrees of oxidation) in comparison with the features of the electronic structure of the transition metals and oxygen. Nitrates of group -1 and group-2 metals are all soluble in water. (ii) Carbonates. The oxides of metals having high positive reduction potentials are not stable towards heat. However, carbonate of lithium, when heated, decomposes to form lithium oxide. 2. The solubilities of these salts further increase on descending the group. 1. All of these carbonates are white solids, and the oxides that are produced are also white solids. In group 1 and 2, the nitrates and carbonates get more stable down the group. 1. As the electropositivity increases from top to bottom, the thermal stability of the oxide also increases from top to bottom. Know of a thumb rule. Transparent heat‐reflective films consisting of ITO–Ag–ITO or ZnO–Ag–ZnO were deposited onto soda‐lime glass by dc magnetron sputtering. 17. If "X" represents any one of the elements: Nature of carbonates and bicarbonates: Alkali metal carbonates and bicarbonate stability increases down the group. Sulphates: Thermal stability The sulphates of group-1 and group-2 metals are all thermally stable. The basic character of alkali metal hydroxide LiOH < NaOH < KOH < RbOH < CsOH 18. Nature of oxide and hydroxide: Alkali metal oxides are basic in nature and their basic character increases gradually on moving down the group. All the carbonates in this Group undergo thermal decomposition to give the metal oxide and carbon dioxide gas. Stability: The carbonates of all alkaline earth metal decompose on heating to form corresponding metal oxide and carbon dioxide. In particular, the oxide layers were deposited from an electrically conductive oxide target. Sodium forms peroxides(M2O2) one Oxygen needs one sodium. Larger cations stabilize larger anions. MCO 3 —-> MO + CO 2 The temperature of decomposition i.e. Looking at the enthalpy change of formation for group 2 metal oxides it’s clearly less energy is needed to break them as you go down the group. Graphite oxide (GO) is an interesting material because of its excellent solubility in water, unlike graphite , , , , .The high dispersion stability of graphite oxide enables it to form a single graphene oxide layer on any substrate so that it can be applied to numerous devices such as flexible displays, transparent conducting films, and transistors for large area electronics Thermal stability. Nitrates of both group 1 and group 2 metals are soluble in water. Solubility. Thermal decomposition is the term given to splitting up a compound by heating it. The carbonates of alkali metals are stable towards heat. Thermal Stability is the decomposition of a compound on heating. 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