Polyatomic Ions

Multiple Choice

Which statement best describes a polyatomic ion?

• A single atom with a charge

• A bundle of atoms acting as a single unit and carrying a charge

• A neutral molecule

• A group of atoms with no charge

Multiple Choice

What is a ternary compound?

• A compound with two types of atoms

• A compound with three or more types of atoms

• A compound with only metals

• A compound with only nonmetals

Multiple Choice

Which of the following is a reason to use parentheses when writing chemical formulas for polyatomic ions?

• To separate different compounds

• To indicate the charge of the ion

• To hold the bundle together and avoid confusion with double digits

• To show the number of electrons

Multiple Select

Select all statements that are true about the compound Ca(MnO4)2.

• It contains 1 calcium atom.

• It contains 2 permanganate ions.

• It contains 4 oxygen atoms.

• It contains 2 manganese atoms.

Multiple Choice

Which of the following is the correct formula for the compound formed by criss-crossing the charges of ammonium and nitrate ions?

• NH4NO3

• NH4Cl

• NH4SO4

• NH4CO3