write the formula for the following covalent compound: selenium hexachloride

Explanation:

Step1: Identify elements and prefixes

Selenium (Se) has no prefix (so 1 atom), hexachloride means 6 chlorine (Cl) atoms (prefix "hexa-" = 6).

Step2: Write formula

Combine the symbols with subscripts: Se (1, so no subscript) and Cl₆. So formula is SeCl₆.

Answer:

$\ce{SeCl_{6}}$