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====== Macro to generate Atomic Number, or Number of Protons, or Number of Electrons from Atomic Symbol=====

The macro in this page returns Atomic Number or Number of Protons, or Number of Electrons based on Atomic Symbol.
This macro has been tested working in v6 and v7.

==== The macros ====
=== Atomic_Number ===

<code topas>
macro Atomic_Number(Atom) {					
#if (Atom == "H") 1     #elseif
 (Atom == "He")	 2     #elseif
 (Atom == "Li")	 3     #elseif
 (Atom == "Be")	 4     #elseif
 (Atom == "B")	 5     #elseif
 (Atom == "C")	 6     #elseif
 (Atom == "N")	 7     #elseif
 (Atom == "O")	 8     #elseif
 (Atom == "F")	 9     #elseif
 (Atom == "Ne")	 10    #elseif
 (Atom == "Na")	 11    #elseif
 (Atom == "Mg")	 12    #elseif
 (Atom == "Al")	 13    #elseif
 (Atom == "Si")	 14    #elseif
 (Atom == "P")	 15    #elseif
 (Atom == "S")	 16    #elseif
 (Atom == "Cl")	 17    #elseif
 (Atom == "Ar")	 18    #elseif
 (Atom == "K")	 19    #elseif
 (Atom == "Ca")	 20    #elseif
 (Atom == "Sc")	 21    #elseif
 (Atom == "Ti")	 22    #elseif
 (Atom == "V")	 23    #elseif
 (Atom == "Cr")	 24    #elseif
 (Atom == "Mn")	 25    #elseif
 (Atom == "Fe")	 26    #elseif
 (Atom == "Co")	 27    #elseif
 (Atom == "Ni")	 28    #elseif
 (Atom == "Cu")	 29    #elseif
 (Atom == "Zn")	 30    #elseif
 (Atom == "Ga")	 31    #elseif
 (Atom == "Ge")	 32    #elseif
 (Atom == "As")	 33    #elseif
 (Atom == "Se")	 34    #elseif
 (Atom == "Br")	 35    #elseif
 (Atom == "Kr")	 36    #elseif
 (Atom == "Rb")	 37    #elseif
 (Atom == "Sr")	 38    #elseif
 (Atom == "Y")	 39    #elseif
 (Atom == "Zr")	 40    #elseif
 (Atom == "Nb")	 41    #elseif
 (Atom == "Mo")	 42    #elseif
 (Atom == "Tc")	 43    #elseif
 (Atom == "Ru")	 44    #elseif
 (Atom == "Rh")	 45    #elseif
 (Atom == "Pd")	 46    #elseif
 (Atom == "Ag")	 47    #elseif
 (Atom == "Cd")	 48    #elseif
 (Atom == "In")	 49    #elseif
 (Atom == "Sn")	 50    #elseif
 (Atom == "Sb")	 51    #elseif
 (Atom == "Te")	 52    #elseif
 (Atom == "I")	 53    #elseif
 (Atom == "Xe")	 54    #elseif
 (Atom == "Cs")	 55    #elseif
 (Atom == "Ba")	 56    #elseif
 (Atom == "La")	 57    #elseif
 (Atom == "Ce")	 58    #elseif
 (Atom == "Pr")	 59    #elseif
 (Atom == "Nd")	 60    #elseif
 (Atom == "Pm")	 61    #elseif
 (Atom == "Sm")	 62    #elseif
 (Atom == "Eu")	 63    #elseif
 (Atom == "Gd")	 64    #elseif
 (Atom == "Tb")	 65    #elseif
 (Atom == "Dy")	 66    #elseif
 (Atom == "Ho")	 67    #elseif
 (Atom == "Er")	 68    #elseif
 (Atom == "Tm")	 69    #elseif
 (Atom == "Yb")	 70    #elseif
 (Atom == "Lu")	 71    #elseif
 (Atom == "Hf")	 72    #elseif
 (Atom == "Ta")	 73    #elseif
 (Atom == "W")	 74    #elseif
 (Atom == "Re")	 75    #elseif
 (Atom == "Os")	 76    #elseif
 (Atom == "Ir")	 77    #elseif
 (Atom == "Pt")	 78    #elseif
 (Atom == "Au")	 79    #elseif
 (Atom == "Hg")	 80    #elseif
 (Atom == "Tl")	 81    #elseif
 (Atom == "Pb")	 82    #elseif
 (Atom == "Bi")	 83    #elseif
 (Atom == "Po")	 84    #elseif
 (Atom == "At")	 85    #elseif
 (Atom == "Rn")	 86    #elseif
 (Atom == "Fr")	 87    #elseif
 (Atom == "Ra")	 88    #elseif
 (Atom == "Ac")	 89    #elseif
 (Atom == "Th")	 90    #elseif
 (Atom == "Pa")	 91    #elseif
 (Atom == "U")	 92    #elseif
 (Atom == "Np")	 93    #elseif
 (Atom == "Pu")	 94    #elseif
 (Atom == "Am")	 95    #elseif
 (Atom == "Cm")	 96    #elseif
 (Atom == "Bk")	 97    #elseif
 (Atom == "Cf")	 98    #elseif
 (Atom == "Es")	 99    #elseif
 (Atom == "Fm")	 100   #elseif
 (Atom == "Md")	 101   #elseif
 (Atom == "No")	 102   #elseif
 (Atom == "Lr")	 103   #elseif
 (Atom == "Rf")	 104   #elseif
 (Atom == "Db")	 105   #elseif
 (Atom == "Sg")	 106   #elseif
 (Atom == "Bh")	 107   #elseif
 (Atom == "Hs")	 108   #elseif
 (Atom == "Mt")	 109   #elseif
 (Atom == "Ds")	 110   #elseif
 (Atom == "Rg")	 111   #elseif
 (Atom == "Cn")	 112   #elseif
 (Atom == "Nh")	 113   #elseif
 (Atom == "Fl")	 114   #elseif
 (Atom == "Mc")	 115   #elseif
 (Atom == "Lv")	 116   #elseif
 (Atom == "Ts")	 117   #elseif
 (Atom == "Og")	 118   #endif					
}					
</code>   

==== Application Example: Generating the Total Number of Electrons in Unit Cell ====

<code topas>
RAW(corundum)  
   CuKa5(0.001)       
   Radius(173) 
   LP_Factor(26.6) 
   Full_Axial_Model(12, 15, 12, 4.6, 4.6) 
   Slit_Width(0.3) 
   Divergence(1)            
 
   Absorption(@, 30) 
 
   ZE(@, 0) 
    
   One_on_X(@, 2000) 
   bkg  @ 0 0 0 0 0 0
    
   STR(R_-3_C) 
      phase_name "Corundum"  
      Trigonal(@  4.758467`, @  12.990371`)  
      site Al num_posns  12 x   0        y 0       z @  0.35228` occ Al   1   beq @  0.30072` prm Al_electrons =Get(num_posns) * Atomic_Number("Al"); 
      site O  num_posns  18 x @  0.30608` y 0       z   0.25     occ O    1   beq @  0.16898` prm O_electrons =Get(num_posns) * Atomic_Number("O"); 
      scale @  0.00208215503`  
      CS_L(@, 274.288734`)  
      Strain_L(@, 0.01637535`) 
      prm = Al_electrons + O_electrons;:300 ' Total Number of Electron in Unit Cell 
</code>  

If any user in our open TOPAS community has suggestion or idea, or bug report on these macros, please kindly let me know and I am happy to learn from you: [[tony.wang@qut.edu.au]]
Thanks for Alan's inspiration about #if. :)