Question

what is the chemical formula for iodine trichloride?
a. icl₃
b. i₃cl
c. i₁cl₃
d. 3icl

Explanation:

• In chemical formula naming, the prefix "tri -" indicates the number 3.
• For binary compounds (compounds with two elements), the first element is named as is (iodine, symbol \(I\)), and the second element (chlorine, symbol \(Cl\)) has its ending changed to -ide. The prefix before the second element's name (trichlori - from tri - meaning 3) indicates the number of the second element's atoms.
• So, for iodine trichloride, there is 1 iodine atom (since no prefix is used for the first element when there is 1 atom, by naming convention) and 3 chlorine atoms.

Answer:

A. \(ICl_3\)