Using IUPAC NAME write the formula of
1) Tetrahydroxozincate(II)
2) Tetrabromidocuprate (II)
3) Tetra carbonyl nickel (0)

Explanation

To derive the chemical formulas from the given IUPAC names, we will follow a systematic approach for each compound.

### 1) Tetrahydroxozincate(II)

**Step 1:** Identify the components of the name.
- "Tetra" indicates there are four hydroxyl (OH) ligands.
- "Hydroxozincate" indicates the presence of zinc (Zn) and that it is an anionic complex.

**Step 2:** Write the formula for the ligands.
- Hydroxyl is represented as OH. Since there are four hydroxyl groups, we write: OH₄.

**Step 3:** Write the formula for zinc.
- The metal is zinc, represented as Zn.

**Step 4:** Determine the charge of the complex.
- The oxidation state of zinc in this complex is +2 (indicated by (II)).
- Each hydroxyl (OH) has a charge of -1, and with four hydroxyls, the total charge from the hydroxyls is -4.
- The overall charge of the complex can be calculated as follows:
\[ \text{Charge of Zn} (+2) + \text{Charge from OH} (-4) = -2 \]

**Step 5:** Combine the components into a formula.
- The formula for tetrahydroxozincate(II) is:
\[ \text{[Zn(OH)₄]}^{2-} \]

### 2) Tetrabromidocuprate(II)

**Step 1:** Identify the components of the name.
- "Tetra" indicates there are four bromide (Br) ligands.
- "Bromidocuprate" indicates the presence of copper (Cu) and that it is an anionic complex.

**Step 2:** Write the formula for the ligands.
- Bromide is represented as Br. Since there are four bromide ions, we write: Br₄.

**Step 3:** Write the formula for copper.
- The metal is copper, represented as Cu.

**Step 4:** Determine the charge of the complex.
- The oxidation state of copper in this complex is +2 (indicated by (II)).
- Each bromide (Br) has a charge of -1, and with four bromides, the total charge from the bromides is -4.
- The overall charge of the complex can be calculated as follows:
\[ \text{Charge of Cu} (+2) + \text{Charge from Br} (-4) = -2 \]

**Step 5:** Combine the components into a formula.
- The formula for tetrabromidocuprate(II) is:
\[ \text{[CuBr₄]}^{2-} \]

### 3) Tetracarbonyl nickel(0)

**Step 1:** Identify the components of the name.
- "Tetra" indicates there are four carbonyl (CO) ligands.
- "Carbonyl" indicates the presence of carbon monoxide as a ligand.
- "Nickel(0)" indicates that nickel has an oxidation state of 0.

**Step 2:** Write the formula for the ligands.
- Carbonyl is represented as CO. Since there are four carbonyls, we write: CO₄.

**Step 3:** Write the formula for nickel.
- The metal is nickel, represented as Ni.

**Step 4:** Determine the charge of the complex.
- The oxidation state of nickel is 0, meaning the overall charge of the complex is also 0.

**Step 5:** Combine the components into a formula.
- The formula for tetracarbonyl nickel(0) is:
\[ \text{Ni(CO)₄} \]

### Final Answers:
1) Tetrahydroxozincate(II): \[ \text{[Zn(OH)₄]}^{2-} \]
2) Tetrabromidocuprate(II): \[ \text{[CuBr₄]}^{2-} \]
3) Tetracarbonyl nickel(0): \[ \text{Ni(CO)₄} \]