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### Theory:

The chemical formula is the easy notation of a molecule (compound).
It shows the exact number of atoms of each element present in a molecule of a substance.
The following steps are used to write down chemical formula:
Step 1: Place the positive radical on the left and the negative radical on the right while writing the symbols of elements/ions side by side.

Step 2: In superscript, write the valencies of the two radicals to the right of their symbols. (The ions'+' and '-' signs were omitted).

Step 3: The valencies of the elements/ions are interchanged. These numbers should be written as subscripts.

However, the number $$1$$ on the symbol's superscript is omitted.
Example:
($$i$$). Calcium chloride ($$CaCl_2$$).

1st step: Place the calcium and chlorine symbols side by side.
$$Ca$$     $$Cl$$

2nd step: Write the valencies of calcium and chlorine to the right of their symbols.
$$Ca^2$$     $$Cl^1$$

3rd step: Interchange the valencies of elements.
$$CaCl_2$$

The chemical formula of Calcium chloride is ($$CaCl_2$$).

($$ii$$). Magnesium chloride ($$MgCl_2$$)

1st step: Place the magnesium and chlorine symbols side by side.
$$Mg$$     $$Cl$$

2nd step: Write the valencies of magnesium and chlorine to the right of their symbols.
$$Mg^2$$     $$Cl^1$$

3rd step: Interchange the valencies of elements.
$$MgCl_2$$

The chemical formula of Magnesium chloride is ($$MgCl_2$$).

($$iii$$). Sodium hydroxide ($$NaOH$$)

1st step: Place the sodium and hydroxide symbols side by side.
$$Na$$     $$OH$$

2nd step: Write the valencies of sodium and hydroxide to the right of their symbols.
$$Na^1$$     $$OH^1$$

3rd step: Interchange the valencies of elements.
$$NaOH$$

The chemical formula of Sodium hydroxide is ($$NaOH$$).

($$iv$$).  Calcium phosphate ($$Ca_3(PO_4){_2}$$)

1st step: Place the calcium and phosphate symbols side by side.
$$Ca$$   $$PO_4$$

2nd step: Write the valencies of calcium and phosphate to the right of their symbols.
$$Ca^2$$     $$(PO_4){_3}$$

3rd step: Interchange the valencies of elements.
$$Ca_3(PO_4){_2}$$

The chemical formula of Calcium phosphate is ($$Ca_3(PO_4){_2}$$).
Chemical or Molecular formula