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chemical properties of group 13 and 14 elements; • explain anomalous behaviour of boron and carbon; • describe allotropic forms of carbon; • know the chemistry of some important compounds of boron, carbon and silicon; • list the important uses of group 13 and 14 elements and their compounds. THE p -BLOCK ELEMENTS
Group 13 elements (Boron Family) are the 1st group of p-block. Elements: Boron, Aluminium, Gallium, Indium, Thallium. Understand their properties, Behaviour and Compounds formed.
16 Δεκ 2018 · Physical Properties: Low electronegativity, hard, absorbs neutrons, steel grey in color. Some dissimilarities of boron with other elements of this group are: (a) Boron does not form positive ions in aqueous solution and has low oxidation potential. (b) Boron always forms covalent compounds (c) Boron is non-metallic
Physical properties The elements of Group 13 have; 1) smaller atomic radii and 2) higher electronegativities compared to s-block elements. However, these properties do not vary in a regular manner. The atomic radius of Ga (135 pm) is slightly less than that ofAl (143 pm).
The group 13 metals. All the elements in group 13 except boron are metals. Common ions: Al3+, Ga3+, In+, Tl+, also sometimes In3+ and Tl3+. Under typical reactions, these metals don't react with water. At room temperature, the oxide formed is M2O3. Al(OH)3, Ga(OH)3 and In(OH)3 are all insoluble in water, but TlOH is very soluble.
In Class XI, you have learnt that the p-block elements are placed in groups 13 to 18 of the periodic table. Their valence shell electronic configuration is ns2np1–6 (except He which has 1s2 configuration). The properties of p-block elements like that of others are greatly influenced by atomic sizes, ionisation enthalpy, electron
12 Απρ 2023 · Learning Objectives. To understand the trends in properties and the reactivity of the group 13 elements. Group 13 is the first group to span the dividing line between metals and nonmetals, so its chemistry is more diverse than that of groups 1 and 2, which include only metallic elements.
