Edexcel A Level Chemistry:复习笔记1.2.4 Electronic Configurations
Electronic Configurations of Atoms & Ions The principal quantum shells increase in energy with increasing principal quantum number E.g. n = 4 is higher in energy than n = 2 The su...
Edexcel A Level Chemistry:复习笔记1.2.3 Orbitals
Orbital Shapes Orbitals Subshells contain one or more atomic orbitals Orbitals exist at specific energy levels and electrons can only be found at these specific levels, not in between them E...
Edexcel A Level Chemistry:复习笔记1.2.2 Quantum Shells
Developing Electronic Configuration Electrons move rapidly around the nucleus in energy shells If their energy is increased, then they can jump to a higher energy level The process is revers...
Edexcel A Level Chemistry:复习笔记1.2.1 Ionisation Energy
Factors Affecting Ionisation Energy Ionisation energy The ionisation Energy (IE) of an element is the amount of energy required to remove one mole of electrons from one mole of gaseous atoms...
Edexcel A Level Chemistry:复习笔记1.1.4 Mass Spectrometry
Interpreting Mass Spectra Isotopes are different atoms of the same element that contain the same number of protons and electrons but a different number of neutrons These are atoms of the sam...
Edexcel A Level Chemistry:复习笔记1.1.3 Relative Mass
Isotopic & Atomic Mass The relative mass of an atom uses the carbon-12 isotope as the international standard One atom of carbon-12 has an accepted mass of 1.992646538 x 10-26 kg It is not reali...
Edexcel A Level Chemistry:复习笔记1.1.2 Isotopes
Atomic Structure Calculations An atom is neutral and has no overall charge Ions on the other hand are formed when atoms either gain or lose electrons, causing them to become charged The numb...
Edexcel A Level Chemistry:复习笔记1.1.1 Structure of the Atom
Structure of the Atom All matter is composed of atoms, which are the smallest parts of an element that can take place in chemical reactions Atoms are mostly made up of empty space around a v...
美国大学学费猛涨，排名前30的有哪些？
美国大学的学费贵，我想这是很多中国家庭的共同感受。而且它每年还都以一定的幅度在上涨着。 *US News统计的近二十年美本学费上涨趋势 受到新冠疫情的影响，全球经济开始下行，这也让全球高校都陷入困顿之中，美...
