Question

why nacl not clna and why hcl not clh​

Answer 1

Answer:

There is a rule according to IUPAC:

That Metals (electropositive elements) are generally written in the beginning and the non-metals(electronegative elements) are written at the endings of any compound's chemical formula.

Therefore, the formula of Sodium Chloride is NaCl and not ClNa.

Similarly, In Hydrochloric acid, Hydrogen is more electropositive than Chlorine and thus, Its written as HCl and not ClH.

Note: This is only applicable to a few of the common compounds not everytime(E.g. in organic chemistry, The chemical formula of soap is written as C₁₇H₃₅ONa and not NaC₁₇H₃₅O)