Question

write the formula for the following covalent compound: selenium hexachloride

Explanation:

Step1: Identify elements and prefixes

Selenium (Se) has no prefix, so 1 atom. Hexa- means 6, so chlorine (Cl) has 6 atoms.

Step2: Write the formula

Combine the symbols with subscripts: Se (1) and Cl (6), so formula is SeCl₆.

Answer:

$\ce{SeCl_{6}}$