Final answer:
The basic SI unit for chemical amount is the mole, which corresponds to 6.02214076×1023 elementary entities of a substance.
Step-by-step explanation:
The basic SI unit for chemical amount is the mole (symbol: mol). It is one of the seven base units in the International System of Units, specifically used to measure the amount of a substance. The mole is defined as the amount of a chemical substance that contains exactly 6.02214076×1023 elementary entities, such as atoms, molecules, ions, or electrons. This number is referred to as Avogadro's number. In a practical sense, the mole allows chemists to convert between atoms/molecules and grams, providing a bridge between the atomic and macroscopic worlds.