Question

the small number that tells how many atoms of an element are present
two or more atoms chemically bonded
large number to the left of a compound that tells you how many of the complete compound are needed in that chemical equation

Explanation:

• Subscript: In a chemical formula, a subscript is a small number written to the right of an element symbol. It indicates the number of atoms of that element in a molecule or formula unit. For example, in \(H_2O\), the subscript \(2\) indicates there are 2 hydrogen atoms.
• Coefficient: A coefficient is a large number written to the left of a chemical formula. It indicates the number of formula units (molecules or formula units of an ionic compound) of a substance in a chemical equation. For example, in \(2H_2O\), the coefficient \(2\) indicates there are 2 water molecules.

Answer:

• For "The small number that tells how many atoms of an element are present": Subscript
• For "Large number to the left of a compound that tells you how many of the complete compound are needed in that chemical equation": Coefficient