User:Just granpa/Atomic volume/doc

See also: User:Just_granpa/Atomic volume (Alternate)

Also see http://www.espimetals.com/index.php/technical-data and Periodic table (crystal structure)

Volume

{{User:Just granpa/Atomic volume}} produces the volume form above.

Calculates the atomic volume by dividing the atomic mass by the density.

For example:

carbon = 12.011 neutron masses / (3510 kg/m^3) = 5.73 angstroms^3

(In other words 3510 kg/m^3 = 12.011 neutron masses/5.73 angstroms^3)

The resulting volume is multiplied by User:Just granpa/Atomic packing factor for the corresponding crystal system.

Background color indicates the crystal structure.

liquid, and amorphous

fcc, hcp, dhcp

bcc

pc, sc, dc

hex, tetr, rho, and mon

The atomic packing factors of hex, tetr, rho, and mon (in red) are not known precisely.


This template repeatedly calls User:Just granpa/Atomic volume cell.
It also calls User:Just granpa/Atomic volume cell (nonelement)

Radius

{{User:Just granpa/Atomic volume|radius}} produces the radius form above.

This template first calculates the atomic volume by dividing the atomic mass by the density (just like above).
Then it calculates the atomic radii.
This template repeatedly calls User:Just granpa/Atomic radius cell.

Radius in units of ground shell radius

{{User:Just granpa/Atomic volume|radius2}} produces the radius form in units of ground shell radius shown above.

A nitrogen atom, for example, is 3 times larger than its ground shell.
By this measure all of the increase in atomic radius occurs between Noble Metals and noble gases.
(Except for a brief and inexplicable increase for alkali metals which are 25% larger than expected)

The radius of the ground shell is assumed to be proportional to 1/Atomic number.
No attempt has been made to account for shielding of the nucleus.


This template repeatedly calls User:Just granpa/Atomic radius2 cell.


Each shell appears to be roughly twice the size of the previous shell so is a natural thing to do is convert the radius to logarithm base 2.

Hence:

Logarithm of radius in units of ground shell radius

{{User:Just granpa/Atomic volume|radius3}} produces the radius form in logarithm of units of ground shell radius shown above.

This template repeatedly calls User:Just granpa/Atomic radius3 cell.