Question

copper(II) chloride

IN THIS QUESTION WHAT IS THE MEANINIG OF (II) ABOVE.
WHY IT IS WRITTEN AND HOW DO I SPELL PLS TELL ME​

Answer 1

Answer:

Copper(II) chloride is the chemical compound with the chemical formula CuCl₂. This is a light brown solid, which slowly absorbs moisture to form a blue-green dihydrate. Both the anhydrous and the dihydrate forms occur naturally as the very rare minerals tolbachite and eriochalcite, respectively. Wikipedia

Formula: CuCl2

Molar mass: 134.45 g/mol

Melting point: 498 °C

Boiling point: 993 °C

Soluble in: Water

IUPAC ID: Copper dichloride, Copper(II) chloride