Edexcel A Level Chemistry:復習筆記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:復習筆記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:復習筆記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:復習筆記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:復習筆記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:復習筆記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:復習筆記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:復習筆記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:復習筆記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...
Edexcel A Level Chemistry:復習筆記1.3.1 Periodicity
Melting & Boiling Point Trends Elements in the periodic table are arranged in order of increasing atomic number and placed in vertical columns (groups) and horizontal rows (periods) The ...
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2022年AMC10/12報名正式開啟，考試時間和報名方式一文說清！
AMC是美國數學思維活動（American Mathematics Competitions）的簡稱，是一項面向世界中學生的數學思維訓練，目前每年全球有超過6000所學校的30萬名學生參加該活動，是當今世界上最科學、最權威、最具信譽度的數...
