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Edexcel AS Atomic Model Flashcards
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- 1Relative atomic massThe weighted mean mass of an atom of an element compared to \(\frac{1}{12}\) of the mass of an atom of carbon-12. \(\frac{\text{Total mass of the atoms}}{\text{Total number of atoms}} \)
- 2Mass numberThe number of protons and neutrons in one atom of an element. The mass number is always a whole number.
- 3IsotopesAtoms of the same element that contain different numbers of neutrons
- 4Relative isotopic massThe mass of an individual atom of a particular isotope relative to \(\frac{1}{12}\) of the mass of an atom of carbon-12. This is not likely to be a whole number.
- 5Relative formula massThe sum of the relative atomic masses of all the atoms in the empirical formula of an molecule
- 6Relative atomic massThe sum of the relative atomic masses of all the atoms in a molecule
- 7Mass spectrometerMeasures the masses of molecules
- 8M/z ratioThe mass-to-charge ratio of a molecules
- 9Molecular ion peakThe peak with the highest m/z ratio, the M peak.
- 10Quantum ShellDefines the energy level of an electron
- 11OrbitalA region within an atom that can hold up to two electrons with opposite spins
- 12Electronic configurationShows the number of electrons in each sublevel of the atom
- 13Hund's ruleStates that electrons will occupy the orbitals singly before pairing takes place
- 14Pauli Exclusion PrincipleStates that two electrons cannot occupy the same orbital unless they have opposite spins. Electron spin is signified by upwards and downwards arrows.
- 15Maximum number of electrons per orbital2
- 16First ionisation energyThe first ionisation energy of an element is the energy required to remove an electron from each atom in one mole of atoms in gaseous atoms
- 17Second ionisation energyThe second ionisation energy of an element is the energy required to remove an electron from each singly charged positive ions in the gaseous state
- 18Shielding effectAn electron can be repelled by electrons in the same or lower orbitals, thus decreasing the nuclear charge experienced by the electron in question.
- 19Nuclear chargeNumber of protons in the nucleus
- 20GroupThe vertical columns in the Periodic Table
- 21PeriodsThe horizontal rows in the Periodic Table
- 22S-blockThe s-block consists of elements in Group 1 and Group 2. The highest energy electron of an element in the s-block is in an s orbital.
- 23P-blockThe p-block consists of elements in Groups 3 to 8. The highest energy electron of an element in the p-block is in a p orbital
- 24PeriodicityA regularly repeating pattern of atomic, physical and chemical properties with increasing atomic number
- 25Covalent radiusThe covalent radius of an element is equal to half the distance between the nuclei when two atoms of that element are covalently bonded together in a homonuclear diatomic molecule
- 26Van der Waals RadiusHalf of the distance between the closest approach of two non-bonded atoms of a given element
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- El usuario ha eliminado su información de asignaturas Fichas sobre Edexcel AS Atomic Model Flashcards, creado por Usuario eliminado el 14/08/2017.
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- Creado por Niamh Ryan · 14 ago 2017
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