const char* OEGetAtomicSymbol(unsigned int elemno)
Return the atomic symbol associated with the specified atomic number.
This function returns a valid pointer to a NUL-character, '\0'
, if
elemno is not greater than zero and less than the symbolic constant
OEElemNo::MAXELEM
. Otherwise all returned values are NUL-terminated,
with the first character uppercase, and the second either a NUL, or a
lowercase character (in which case the third character is always the
NUL-terminator).