Arrangement Of The Electrons In The Atom Flashcards
Who provided an insight into the arrangement of electrons in the atom?
Niels Bohr
When white light is passed through a glass prism, what kind of spectrum is formed?
A continuous spectrum
Describe a continuous spectrum
A rainbow
What is formed when light from a hydrogen discharge tube if passed through a glass prism?
An emission line spectrum
What instrument do you use to study Spectrums?
Spectrometer
When burned what colour do these metals turn into
- Lithium
- Potassium
- Barium
- Strontium
- Copper
- Sodium
- Crimson
- Lilac
- Green
- Red
- Blue-green
- Yellow
What is the Balmer series?
Lines that are in the visible section of the spectrum
N=2
Describe how an Emission Line Spectrum is formed // What is the evidence that there are energy levels?
> Electron is normally in its lowest available energy level Ground state
> Electron gets excited by head or electricity
> Jumps to a higher energy level 📈
> Now it is not stable
> Drops back to a lower level📉
> As it falls down it releases a Photon ⚡️ or electromagnetic radiation
> Frequency of energy emitted is proportional to the drop (difference in energy)
> (E2-E1)=hf (h is plants constant and f is frequency of radiation)
> Spectral lines formed are evidence of energy levels
Define energy level
The fixed energy value that an electron in an atom may have
Define excited state
When the electrons occupy higher energy levels that those available in the ground state
What is atomic absorption spectrum.
Dark lines observed in a spectrum
atoms can absorb light
Consist of dark lines against a coloured background
What are the uses of Atomic Absorption Spectrometry
Used in the analysis of water for metals like lead, mercury, cadmium.
Detect heavy metals
Define Heisenberg’s Uncertainty Principe
It states that it is impossible to measure the velocity and the position of an electron at the same time
What were some limitations to Bohr’s theory
Bohrs didn’t take account that electrons had a wave motion
Didn’t take into account the presence of sublevels
Define an Orbital
Region in space which there is a high probability of finding an electron
