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...
