Bohr’s Theory Flashcards
Lithium Chloride produces the colour
Crimson Red
Potassium Chloride produces the colour
Lilac
Barium Chloride produces the colour
Green
Strontium Chloride produces the colour
Dark red
Copper Chloride produces the colour
Blue/green
Sodium Chloride produces the colour
Yellow
What is an continuous spectrum
When white light is passed through a glass prism it produces a array of colours
What is a line emission spectrum
a series of coloured lines that correspond to specific frequencies of light emitted when electrons in an element are excited
What is an electron configuration
How the electrons are arranged in the shells/energy levels of an atom
Example of emission line spectrum in everyday life
Sodium streetlights glow yellow
Describe the flame test
Fume cupboard
Concentrated Hydrochloric acid
Platinum wire
If wire is clean there should be no colour produced
Crush salt with Pestle and mortar
Identify the metal from the salt
What is an every level
Fixed energy level that an electron in an atom may have
What is the ground state
Electrons occupy the lowest available energy level
What is the excited state
Where electrons occupy higher energy levels than those available in the ground state
Describe Bohr’s theory
Bohr states that electrons reside in fixed energy levels
The hydrogen gaseous ( named substance) electrons are in the ground state
They occupy the lowest energy level and are stable
When and electrical current is passed through the hydrogen gas a fixed amount of this every is absorbed and electrons jump to the next available energy level. Excites state electron are unstable and fall back down to lower levels after a short time and release a photon of light in a definite frequency. Since only definite amounts of energy are emitted, this implies that electrons can occupy only definite energy levels.
Each definite amount of energy emitted gives rise to a line in the emission spectrum.
What is the formula for difference in energy
E2-E1 = hf
Which is the visible series of energy levels
N=2 Balmer series(red visible light)
Why do different metals produce different flame colours
Each element has a different electron configuration
Therefore different electron transitions are possible
So different frequencies of light will be emitted from each element
What does AAS stand for
Atomic absorption Spectrometry
What is AAS
When white light is passed through a gaseous sample of an element, certain wavelengths were missing.
These lines correspond excatly to the lines produced in produced in the emission line spectrum
What can AAs be used for
Identifying dangerous elements in water
List energy sub level from1-4
4f
4d
4p
3d
4s
3p
3s
2p
2s
1s
What is a Sublevel
A subdivision of a main energy level and consists of one or more orbitals of the same energy
Who found the wave particle duality
Louis de Broglie
What is Heisenberg’s uncertainty principle
States that it is importable to measure both velocity and position of an electron at the same time
Limitations of Bohr’s Theory
- He didn’t take into account wave particle duality
2.Heisenbergs uncertainty principle is conflicting - Didn’t take into account sub levels
What is an orbital
Region in space where there is a high probiotic of finding an electron
Who devised a equation to work out the probiotic of finding an electron in a particular sublevel
Erwin Schrödinger
Describe a S sub level
Spherical and each contain 1 orbital
Describe a P sub level
Dumbbell shaped
Conduits of three orbitals (Px ,Py, Pz)
Describe D orbitals
They contain 5 orbitals
How many electrons does each orbital hold
2
What is wave particle dualitiy
All moving electrons actually move in a wave motion
