The transmittance in the visible range of the ITO–Ag–ITO film was more than 80% and the reflectance at 10 μm was nearly 95%. Sulphates: Thermal stability The sulphates of group-1 and group-2 metals are all thermally stable. Thermal Stability is the decomposition of a compound on heating. Nature of carbonates and bicarbonates: Alkali metal carbonates and bicarbonate stability increases down the group. Transparent heat‐reflective films consisting of ITO–Ag–ITO or ZnO–Ag–ZnO were deposited onto soda‐lime glass by dc magnetron sputtering. Thermal stability. Sodium forms peroxides(M2O2) one Oxygen needs one sodium. However, carbonate of lithium, when heated, decomposes to form lithium oxide. The higher the temperature needed to decompose something, the more thermally stable it is. MCO 3 —-> MO + CO 2 The temperature of decomposition i.e. Solubility. The decreasing order is L i 2 O > N a 2 O > K 2 O > R b 2 O Hence, the option D is correct. Nature of oxide and hydroxide: Alkali metal oxides are basic in nature and their basic character increases gradually on moving down the group. Nitrates of group -1 and group-2 metals are all soluble in water. 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. In group 1 and 2, the nitrates and carbonates get more stable down the group. The thermal stability of the metal oxide depends on its electropositive nature. Know of a thumb rule. The oxides of metals having high positive reduction potentials are not stable towards heat. The basic character of alkali metal hydroxide LiOH < NaOH < KOH < RbOH < CsOH 18. As we move down group 1 and group 2, the thermal stability of nitrate increases. Thermal decomposition is the term given to splitting up a compound by heating it. The solubilities of these salts further increase on descending the group. As the electropositivity increases from top to bottom, the thermal stability of the oxide also increases from top to bottom. 1. In particular, the oxide layers were deposited from an electrically conductive oxide target. D) On moving down the group, the thermal energy and the lattice energy of the oxides of alkali metals decrease. 2. All of these carbonates are white solids, and the oxides that are produced are also white solids. The carbonates of alkali metals are stable towards heat. All the carbonates in this Group undergo thermal decomposition to give the metal oxide and carbon dioxide gas. 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 So, as the thing goes, Lithium forms oxides(M2O) one oxygen balanced by two lithium atoms. (ii) Carbonates. 17. 1. Nitrates of both group 1 and group 2 metals are soluble in water. solubility: sulphates of alkali metals are soluble in water. If "X" represents any one of the elements: 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. Introduction. Larger cations stabilize larger anions. 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