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ѕoмe вaѕιc concepтѕ repreѕenтed вy👉💞 What is the difference between s-block and p-block elements?🤔 ᑕOᑎᑕƐᑭTS : They are grouped as s-block or p-block according to the position of valence electrons in orbitals. The main difference between s and p block elements is that the valence electrons of the s-block elements are in the s-orbital whereas the valence electrons of the p-block elements are in the p-orbital. What behaviour of the third period of p-block elements?🤔 ᑕOᑎᑕƐᑭTS : The third period elements of p-groups with the electronic configuration 3s2 ,3pn have the vacant 3d orbitals lying between the 3p and the 4s levels of energy. Using these d-orbitals the third period elements can expand their co-valence above four. How does the presence of d-orbitals affect the properties of heavier metals?🤔 ᑕOᑎᑕƐᑭTS : The presence of d-orbitals influences the chemistry of the heavier elements in these ways: 1. The combined effect of size and availability of d orbitals considerably influences the ability of these elements to form ππ bonds. 2. The first member of a group differs from the heavier members in its ability to form pπ−pπpπ-pπ multiple bonds to itself. Why heavier metals show reluctance for pπ-pπ bonding ?🤔 ᑕOᑎᑕƐᑭTS : The heavier elements do form ππ bond but this involves d orbitals (dπ−pπ or dπ−dπ)(dπ-pπ or dπ-dπ) type bonding as the d orbitals are of higher energy than the p orbitals, they contribute less to the overall stability of molecules than does pπ−pπpπ-pπ bonding of the second row elements. What are the properties of the Boron group of elements?🤔 ᑕOᑎᑕƐᑭTS : 1. Boron is a typical non-metal, aluminium is a metal but shows many chemical similarities to boron, and gallium, indium, thallium and nihonium are almost exclusively metallic in character. 2. Boron is a fairly rare element, mainly occurs as orthoboric acid, (H3BO3), borax, Na2B4O7·10H2O, and kernite, Na2B4O7·4H2O  3. The abundance of boron in earth crust is less than 0.0001% by mass.