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...
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...
如何選科，是大多數家長最關心和糾結的地方。主要看孩子的興趣、后面課程的要求以及時間上的安排。所以小編今天給大家介紹一下2022年GCSE最受歡迎的考試科目！幫助大家進行一個參考！ NO.10：法語 學習外語能帶來...
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...
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...
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...
Mass & Charge Distribution The mass of an atom is?concentrated?in the nucleus, because the nucleus contains the heaviest subatomic particles (the neutrons and protons) The mass of the electron ...
Titrations Volumetric analysis?is a process that uses the volume and concentration of one chemical reactant (a standard solution) to determine the concentration of another unknown solution The tech...
Concentration Calculations Step by step Concentration calculations involve bringing together the skills and knowledge you have acquired previously and applying them to problem solving You should be...
