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3 Chem Live

Arrangement of electrons in the atom

TermDefinition
Line Spectrum A series of narrow coloured lines
Atomic Emission Spectra Atoms emit light, giving a series of coloured lines on a black background
Atomic Absorption Spectra Atoms absorb light, giving a series of black lines on a coloured background.
Spectrometer Instrument used to carry out measurements on spectra
Energy level Discrete or fixed amount of energy that an electron in an atom may have.
Ground State is one in which the electrons occupy the lowest available energy level
Excited state is one in which the electrons occupy higher energy levels than those available in the ground state
Bohr Theory E*-E =hf
Paschen series of lines in the Infra red region
Balmer series of lines in the visible region
Lyman series of lines in the Ultra violet spectrum
Energy Sublevel is a subdivision of the main energy level and consists of one or more orbitals of the same energy.
Orbital is a region in space where there is a high probability of finding an electron.
Heisenberg's Uncertainty Principle states that it is impossible to measure at the same time both the velocity and the position of an electron.
De Broglie Suggested that all moving particles have a wave motion associated with them
Atom The smallest particle of an element that can take part in a chemical reaction
Cation A positively charged ion
Diffraction A change in direction of a wave as it passes through an opening
Electron Negatively charged particle present in all atoms and located in orbitals outside the nucleus
Element A substance which cannot be decomposed or broken down into simpler substances by chemical methods
Atomic Absorption spectrum used for detecting the analysis of heavy metals (lead, mercury & cadmium) in water or blood & to test for gunshot residue.
Limitations of Bohrs Theory He did not take into account the wave nature of an electron, was in conflict with Heisenbergs uncertainty principle and couldn't account for the splitting of certain lines in the spectra and didn't account for the presence of sublevels.
Bohrs model of an electron An electron travelling in a precise path at a precise distance from the nucleus
S orbital Spherical shaped
P orbital dumbbell-shaped
P sublevel consists of the 3 p orbitals px, py & pz.
When an electron transitions from n=3 to n=2 what colour is observed in the balmer series Red
How many lines in the Balmer series 4, when the electron drop from n =3 it's Red, n=4 it's teal, n=5 it's Blue, n=6 it's indigo,
Created by: Ms O'Farrell
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