@Override
    public String getSymbol() {
        if (atomicNumber == null)
            return null;
        if (atomicNumber == 0)
            return "R";
        return Elements.ofNumber(atomicNumber).symbol();
    }
@ Override public String getSymbol ( ) { if ( atomicNumber == null ) return null ; if ( atomicNumber == 0 ) return "R" ; return Elements . ofNumber ( atomicNumber ) . symbol ( ) ; }
Returns the element symbol of this element.

@return The element symbol of this element. Null if unset.

@see    #setSymbol