Respuesta :

Answer:  +1

Explanation:

Nickel is the transitional metal in the compound

The overall charge of the compound Ni₃P

    = the sum of the charges of element × the number number of atoms

Because Ni₃P is a neutral compound, then the overall charge of the compound is zero.

⇒  3 (charge of Ni) + (charge of P) = 0

⇒  3 (charge of Ni) = - (charge of P)           [Redox Rules: Group 15

                                                                       elements of -3.]

⇒ 3 (charge of Ni)  = - (-3)

       (charge of Ni) =  + 1