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ydrogen spectrum

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by

Harvey Buckle

on 17 February 2016

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Transcript of ydrogen spectrum

Hydrogen spectrum, Ionisation energy and principal quantum numbers
Aim
To know the phenomenon of Ionisation energy
To know how both the Hydrogen spectrum and ionisation energy are related to principal quantum numbers
Watch and write
Things to notice about the equation


The state symbols - (g) - are essential. When you are talking about ionisation energies, everything must be present in the gas state.

Ionisation energies are measured in kJ mol-1 (kilojoules per mole). They vary in size from 381 (which you would consider very low) up to 2370 (which is very high).
Now
Describe the Empat factors affecting the SIZE of the ionisation energy
Starter
State: Aufbau, Hunds and PEP rules
Ionisation energy


Definition

The first ionisation energy is the energy required to remove the most loosely held electron from one mole of gaseous atoms to produce 1 mole of gaseous ions each with a charge of 1+.

This is more easily seen in symbol terms.


And...
All elements have a first ionisation energy - even atoms which don't form positive ions in test tubes. The reason that helium (1st I.E. = 2370 kJ mol-1) doesn't normally form a positive ion is because of the huge amount of energy that would be needed to remove one of its electrons.
Patterns of first ionisation energies in the Periodic Table
The first 20 elements
Explain this
Full transcript