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Atomic Structure- Physical Chem. PAPER 1
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- 1Definitions isotopes relative isotopic mass relative atomic mass relative molecular massISOTOPES- atoms of the SAME ELEMENT with DIFFERENT number of NEUTRONS.
RELATIVE ISOTOPIC MASS- mass of an atom of an isotope compared with 1/12th of the mass of CARBON 12.
RELATIVE ATOMIC MASS- AVERAGE mass of an atom of an element compared to 1/12th of the mass of CARBON 12.
RELATIVE MOLECULAR MASS- mass of a molecule of a scale where 1 carbon 12 atom has an exact mass of 12 - 2Definitions 2 ionisation energy aufbau principal hunds rule pauli principalIonisation Energy- Energy required to remove 1 electron from each atom in 1 mole of GASEOUS atoms to form 1 mole of pos. ions
Aufbau Principal- Electrons fill lowest energy level first.
Hunds Rule- orbitals are filled singularly before pairing. First 3 orbitals have same energy. Repulsion occurs in orbitals.
- Pauli Principal- no more than 2 electrons can enter an atomic orbital. - 3Calculating Relative Atomic Masssum of (mass*abundance)
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total abundance - 4Time of flight mass spectrometry v= d/t k.e= 1/2*m*V^21) Sample DISSOLVED in VOLATILE solution. Injected with needle connected to + end of battery. Solvent evaporates. 1+ IONS FORMED.
2) Ions ACCELERATED through electric field to neg. plate. IONS ACCELERATED TO SAME K.E.
3) Ions travel at DIFFERENT SPEEDS and are therefore separated
4) Ratio formed. Current generated from electrons moving to ion to form atoms. Peak of current are electrical impulses and compared. Height of peak= abundance of isotope. - 5Electronic Configuration.- D block loses 4s electrons first to form ion
Cr= 1s2 2s2 2p6 3s2 3p6 4s1 3d5
Cu= 1s2 2s2 2p6 3s2 3p6 4s1 3d10
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- A level Chemistry Flashcards on Atomic Structure- Physical Chem. PAPER 1, created by Eirinn O’Kane on 08/03/2018.
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- Eirinn O’Kane
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