AQA A Level Maths: Pure复习笔记2.5.3 Factor Theorem
Factor Theorem What is the factor theorem? The factor theorem is a very useful result about polynomials A polynomial is an algebraic expression consisting of a finite number of terms, with n...
IB DP Chemistry: HL复习笔记3.1.3 Periodic Trends: Physical - Ionisation Energy
First 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 atoms of an element in the gaseous state to form o...
IB DP Chemistry: HL复习笔记3.1.2 Periodic Trends: Physical - Atomic & Ionic Radius
Atomic & Ionic Radius Atomic radius The atomic radius of an element is a measure of the size of an atom It is the distance between the nucleus of an atom and the outermost electron shell It can...
IB DP Chemistry: HL复习笔记3.1.1 The Periodic Table
Structure of the Periodic Table The periodic table is a list of all known elements arranged in order of increasing atomic number, from 1 to 118. In addition to this, the elements are arranged in su...
IB DP Chemistry: HL复习笔记2.1.8 Writing Electron Configurations
Electron Configurations: Basics The electron configuration gives information about the number of electrons in each shell, subshell and orbital of an atom The subshells are filled in order of increa...
帝国理工环境生物学学什么？
近几年，从雾霾、垃圾分类，到现在白鲟灭绝、全网唏嘘。政府政策引导，环保意识已经渗透到了生活的方方面面，大势所趋，环境科学类专业是中国核心科技，未来一定大有作为。不过，很多人仍然对这类专业知之甚少。...
IB DP Chemistry: HL复习笔记2.1.7 Sublevels & Orbitals
Electron Orbitals Each shell can be divided further into subshells, labelled s, p, d and f Each subshell can hold a specific number of orbitals: s subshell : 1 orbital p subshell : 3 orbitals label...
IB DP Chemistry: HL复习笔记2.1.6 Energy Levels & Sublevels
Electron Energy Levels Shells The arrangement of electrons in an atom is called the electronic configuration Electrons are arranged around the nucleus in principal energy levels or principal quantu...
IB DP Chemistry: HL复习笔记2.1.5 Emission Spectra
Emission Spectra 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 reversible, so electrons can ret...
IB DP Chemistry: HL复习笔记2.1.4 The Electromagnetic Spectrum
The Electromagnetic Spectrum The electromagnetic spectrum is a range of frequencies that covers all electromagnetic radiation and their respective wavelengths and energy It is divided into bands or...
IB DP Chemistry: HL复习笔记2.1.3 Relative Atomic Mass Calculations
Relative Atomic Mass Calculations 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 sa...
IB DP Chemistry: HL复习笔记2.1.2 Deducing Subatomic Particles
Atoms: Key Terms The atomic number (or proton number) is the number of protons in the nucleus of an atom and has the symbol Z The atomic number is also equal to the number of electrons that are pre...
