Atomic structure

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Sorted FAQs on Atomic Structure

This topic has attracted quite a lot of questions to Re:act over the years. To help you find the ones of most interest to you more easily, whether they are about background theory or a particular experiment, we have sorted the FAQs under several headings below, with a direct link to each question and answer.
 
List of headings - some FAQs may appear under more than one heading:

1. Subatomic particles
•Subatomic particles: fluorine atom?
•Subatomic particles: which most important for physical properties
•Subatomic particles: discoverer of the neutron
2. Flame colours
•Energy of yellow photons
•Flame colours: why none for Mg?
•Flame colours: list
3. Line spectra
•H-atom: why a line spectrum - how many energy levels
•H-atom: why more emission than absorption lines?
•H-atom: why is electron not sucked into nucleus?
•Line spectra: why do lines get closer?
•Line spectra: lilac line in daylight spectrum?
•Electron transition: which is gain in energy?
4. Mass spectra
•Mass spectra: calculating relative intensity of parent ions for CH₂Cl₂
•Mass spectra: drawing a Mo spectrum
5. Isotopes
•Isotopes: definition
•Isotopes: calculating relative abundance
•Calculation of RAM of copper
6. Ionisation energies
•1st Ionisation energy: N vs O - reasons for difference?
•1st Ionisation Energy vs Electronegativity for Noble Gases
•Ionisation energy: identifying Group from I.E.
•Why ionisation energy of Zn > Ga?
7. Electrons
•Electrons: order of filling - why 4s before 3d?
•Stability of half full sub-shell - N vs O?
•Electrons: identifying atom from excited state configuration
•Electrons: what makes a full shell stable?
•Electrons: configuration for nitride ion, N^3-?
8. Radii
•Atomic radii: van der Waals and covalent
•Ionic radii: trend for P,S & Cl
•Ionic radii: difficulty in measuring
9. Miscellaneous
•The difference between a single atom (eg Cl) and a free radical?
•3d Elements in 4th Period - why?
•Difference between relative formula mass and relative molecular mass. Calculation of molecular mass.
•Finding RAM Li: loss of hydrogen gas

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updated: 08 August 2008