Table:
text: Protactinium
Chemical compounds
Chemical compounds
Formula color symmetry space_group No_ Pearson_symbol a_pm b_pm c_pm Z density_g_cm3_
PaBr5 red monoclinic P21/c 14 mP24 838.5 1120.5 1214.6 4 4.98
PaOBr3  monoclinic C2   1691.1 387.1 933.4  
Pa(PO3)4  orthorhombic    696.9 895.9 1500.9  
Pa2P2O7  cubic Pa3   865 865 865  
Pa(C8H8)2 golden-yellow monoclinic    709 875 1062  

text: Protactinium
Chemical compounds
Chemical compounds
Formula color symmetry space_group No_ Pearson_symbol a_pm b_pm c_pm Z density_g_cm3_
Pa silvery-gray tetragonal I4/mmm 139 tI2 392.5 392.5 323.8 2 15.37
PaO  rocksalt Fm3m 225 cF8 496.1   4 13.44
PaO2 black fcc Fm3m 225 cF12 550.5   4 10.47
Pa2O5 white  Fm3m 225 cF16 547.6 547.6 547.6 4 10.96
Pa2O5 white  orthorhombic   692 402 418  
PaH3 black cubic Pm3n 223 cP32 664.8 664.8 664.8 8 10.58
PaF4 brown-red monoclinic C2/c 15 mS60    2 
PaCl4 green-yellow tetragonal I41/amd 141 tI20 837.7 837.7 748.1 4 4.72
PaBr4 brown tetragonal I41/amd 141 tI20 882.4 882.4 795.7  
PaCl5 yellow monoclinic C2/c 15 mS24 797 1135 836 4 3.74

Question: What is the total number of compounds that show monoclinic symmetry among protactinium?