Edexcel A Level Chemistry:复习笔记1.5.1 Electronegativity
Defining Electronegativity Electronegativity is the power of an atom to attract the pair of electrons in a covalent bond towards itself The electron distribution in a covalent bond between e...
Edexcel A Level Chemistry:复习笔记1.4.8 Shapes of Covalent Compounds
Electron Pair Repulsion & Shape The valence shell electron pair repulsion theory (VSEPR) predicts the shape and bond angles of molecules Electrons are negatively charged and will repel o...
Edexcel A Level Chemistry:复习笔记1.4.7 Bond Length & Bond Strength
Bond Length & Bond Strength Bond energy The bond energy is the energy required to break one mole of a particular covalent bond in the gaseous states Bond energy has units of kJ mol-1 &nb...
Edexcel A Level Chemistry:复习笔记1.4.6 Covalent Dot-and-Cross Diagrams
Covalent Dot-and-Cross Diagrams Covalent compounds The atoms in covalent compounds will share their outer valence electrons to achieve a noble gas configuration Dot-and-cross diagrams of cov...
Edexcel A Level Chemistry:复习笔记1.4.5 Covalent Bonding Overview
Covalent Bonding Covalent bonding occurs between two non-metals A covalent bond involves the electrostatic attraction between nuclei of two atoms and the bonding electrons of their outer she...
Edexcel A Level Chemistry:复习笔记1.4.4 Physical Properties of Ionic Compounds
Physical Properties of Ionic Compounds Most ionic, metallic and covalent solids are crystalline lattices The ions, atoms or molecules are arranged in a regular and repeating arrangement Gian...
Edexcel A Level Chemistry:复习笔记1.4.3 Ionic Trends
Ionic Radius Ionic radius The ionic radius of an element is a measure of the size of an ion Ionic radii show predictable patterns Ionic radii increase with increasing negative charge Ionic r...
Edexcel A Level Chemistry:复习笔记1.4.2 Representing Ionic Bonding
Ionic Dot-and-Cross Diagrams Dot and cross diagrams are diagrams that show the arrangement of the outer-shell electrons in an ionic or covalent compound or element The electrons are shown as...
Edexcel A Level Chemistry:复习笔记1.4.1 Ionic Bonding Overview
Ionic Bonds As a general rule, metals are on the left of the periodic table and nonmetals are on the right-hand side Ionic bonding involves the transfer of electrons from a metallic element to a no...
