Which concept identifies the elements present in a compound and their respective quantities?

Which concept identifies the elements present in a compound and their respective quantities?

• A. Isotope
• B. Chemical formula
• C. Bond
• D. Periodic table

Answer: (B)

Understanding what a compound is made of and in what amounts is shown by a chemical formula. It lists each element present with its symbol and uses subscripts to indicate how many atoms of that element are in one molecule or formula unit. For example, CO2 means one carbon atom and two oxygen atoms per molecule, while NaCl means one sodium and one chlorine per unit. This is different from an isotope, which is a variant of an element with a different number of neutrons, a bond, which describes how atoms are connected but not the exact counts of each element, and the periodic table, which catalogs elements rather than detailing a specific compound’s composition.

Understanding what a compound is made of and in what amounts is shown by a chemical formula. It lists each element present with its symbol and uses subscripts to indicate how many atoms of that element are in one molecule or formula unit. For example, CO2 means one carbon atom and two oxygen atoms per molecule, while NaCl means one sodium and one chlorine per unit. This is different from an isotope, which is a variant of an element with a different number of neutrons, a bond, which describes how atoms are connected but not the exact counts of each element, and the periodic table, which catalogs elements rather than detailing a specific compound’s composition.