Write the correct formula for the compound formed by each of the following pairs of ions. 1.) ni^2+, so4^2- 2.) al^3+, o^2- 3.) ca^2, clo3- 4.) nh4+, p^3- 5.) cu+, no3-

1.) NiSO₄; 2.) Al₂O₃; 3.) Ca(ClO₃)₂; 4.) (NH₄)₃P; 5.) CuNO₃

 Step-by-step explanation:

We can use the criss-cross method to work out the formulas. The steps are

If we use this method, the formula for the compound formed from Na⁺, SO₃²⁻ becomes Na₂SO₃.

1.) Ni²⁺ +  SO₄²⁻  ⟶ Ni₂(SO₄)₂ ⟶ NiSO₄

2.) Al³⁺ +  O²⁻     ⟶  Al₂O₃

3.) Ca²⁺ + ClO₃⁻ ⟶ Ca(ClO₃)₂  

4.) NH₄⁺ + P³⁻    ⟶ (NH₄)₃P  

5.) Cu⁺ + NO₃⁻   ⟶ CuNO₃

if you mean hydrogen and oxygen then water is the product

there is none because earth is stationary and flat.