Criss-Cross Ionic Formula Writing

What is the first step in writing the formula for an ionic compound?

• Write the name of the compound

• Find the charge of the cation and anion

• Balance the equation

• Draw the Lewis structure

What is the correct formula for barium chloride?

• BaCl2

• BaCl

• Ba2Cl2

• Ba2Cl

When writing the formula for magnesium phosphate, why do we use parentheses?

• To show the charge of magnesium

• To indicate a polyatomic ion

• To separate the elements

• To make the formula look neat

What do Roman numerals indicate in the name of a compound like cobalt nitrite?

• The number of electrons

• The number of atoms

• The charge of the transition metal

• The type of bond

What is the formula for hydrogen phosphide?

• HP

• H2P

• H3P

• HP3