I1, I2, I3, of an element are 176, 346 a...

`I_1, I_2, I_3,` of an element are 176, 346 and 1850K.cals respectively. The molecular formula of its phosphate is

`M_3PO_4`

`MPO_4`

`M_2(PO_4)_3`

`M_3(PO_4)_2`

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