type Periodic_table

The periodic table object.

Instance Methods

new empty dictionary __init__(self)
Set up the periodic table object.

Element instance _add(self, atomic_number=None, symbol=None, name=None, atomic_weight=None)
Add an element to the table.

_get_isotope(self, symbol=None, A=None)
Return the matching isotope container.

float atomic_mass(self, id=None)
Return the isotopic atomic mass or standard atomic weight as a float.

float atomic_weight(self, symbol=None)
Return the standard atomic weight as a float for the given atom.

float gyromagnetic_ratio(self, isotope=None)
Return the gyromagnetic ratio for the isotope.

bool has_element(self, symbol=None)
Check if the periodic table contains an atom for the give symbol.

str lookup_symbol(self, atomic_number=None)
Return the atomic symbol corresponding to the atomic number Z.

Inherited from dict: __cmp__, __contains__, __delitem__, __eq__, __ge__, __getattribute__, __getitem__, __gt__, __iter__, __le__, __len__, __lt__, __ne__, __new__, __repr__, __setitem__, __sizeof__, clear, copy, fromkeys, get, has_key, items, iteritems, iterkeys, itervalues, keys, pop, popitem, setdefault, update, values, viewitems, viewkeys, viewvalues

Class Variables

Inherited from dict: __hash__

Method Details

__init__(self)
(Constructor)

Set up the periodic table object.

Returns:

new empty dictionary

Overrides: dict.__init__

_add(self, atomic_number=None, symbol=None, name=None, atomic_weight=None)

Add an element to the table.

Parameters:

• atomic_number (int) - The atomic number Z.
• symbol (str) - The atomic symbol.
• name (str) - The chemical element name.
• atomic_weight (str) - The atomic weight number for the atom. This is a string as it uses the IUPAC notation of, for example, "[1.00784, 1.00811]" and "4.002602(2)" to represent ranges and uncertainty.

Returns: Element instance

The element container object.

_get_isotope(self, symbol=None, A=None)

Return the matching isotope container.

Parameters:

• symbol (str) - The atomic symbol.
• A (int) - The mass number of the isotope.

atomic_mass(self, id=None)

Return the isotopic atomic mass or standard atomic weight as a float.

Parameters:

• id (str) - The atom or isotope identifier. To select isotopes, merge the mass number A with the symbol to form the ID. To select atoms, just set the ID to the atomic symbol. For example, '15N' selects the 15N nitrogen isotope, whereas 'N' selects the nitrogen atom.

Returns: float

The isotopic atomic mass or the standard atomic weight.

atomic_weight(self, symbol=None)

Return the standard atomic weight as a float for the given atom.

Parameters:

• symbol (str) - The atomic symbol.

Returns: float

The standard atomic weight.

gyromagnetic_ratio(self, isotope=None)

Return the gyromagnetic ratio for the isotope.

Parameters:

• isotope (str) - The isotope name, e.g. '15N'.

Returns: float

The desired gyromagnetic ratio.

Raises:

• RelaxError - If the nucleus type is unknown.

has_element(self, symbol=None)

Check if the periodic table contains an atom for the give symbol.

Parameters:

• symbol (str) - The atomic symbol.

Returns: bool

True if the symbol is in the periodic table, False otherwise.

lookup_symbol(self, atomic_number=None)

Return the atomic symbol corresponding to the atomic number Z.

Parameters:

• atomic_number (int) - The atomic number Z.

Returns: str

The atomic symbol.