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MHT-CET : Chemistry Entrance Exam

MHT - CET : Chemistry - Third Row Elements Glossary

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                     Representative Elements: Elements of the third row which represent the characteristic properties of the elements of the whole group to which they belong are called representative elements.

                     Ionisation Potential: The energy required to remove an electron from an atom in the gaseous phase is called ionisation potential.

                     Electronegativity: The tendency of an atom in a molecule to attract electrons towards itself from a covalent bond is called electronegativity.

                     Electropositivity: The tendency of an atom to donate electrons from its outermost shell is called electropositivity.

                     Oxidising Agents: The substance which accepts electrons and makes another substance loose electrons is called an oxidising agent.

                     Reducing Agents: The substance which loses electrons and makes another substance accept electrons is called reducing agent.

                     Crystal Lattice: The orderly, geometrical, three-dimensional pattern of atoms, ions or molecules present in a crystal is called crystal lattice.

                     Metallic Solids: Metallic solids consist of cations bound to free electrons by metallic bonds.

                     Covalent Solids: Substances in which the atoms in the entire crystal lattice are held together by an extensive network of strong covalent bonds are called network solids or covalent solids.

                     Molecular Solids: Substances in which small groups of atoms-molecules are separated by distances larger than bond lengths are called molecular solids.

                     Ionic Solids: Substances which consist of ions at the lattice points are called ionic solids.

                     Metallic Bond: The force of attraction which binds metal cations to mobile electrons within its sphere of influence in a metal is called metallic bond.

                     Body Centred Cubic Structure: A crystal unit cell is said to be body-centred when there is a lattice point (centre of a atom) at the centre of each cubic unit cell.

                     Face Centred Cubic Structure: A crystal unit cell is said to be face-centred when there is a lattice point (centre of an atom) at the centre of each face of the unit cell.

                     Basic Oxides: Oxides of metals that react with water to form an alkaline solution are called basic oxides. Basic oxides react with an acid to give salt and water.

                     Acidic Oxides: Oxides of non-metals that react with water to form acidic solution are called acidic oxides. Acidic oxides react with bases to give salt and water.

                     Amphoteric Oxides: Oxides that react with acids as well as bases to form salt and water are called amphoteric oxides.

                     Malleability: The tendency of a metal to undergo flattening when hammered is called malleability.

                     Ductility: The tendency of a metal by which a wire can be drawn from it is called ductility.

 

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