WILL GIVE BRAINLIEST FOR BOTH CORRECT ANSWERS WILL REPORT LINKS AND OR SPAM 1. What is an isotope?
2. What does the number next to isotopes signify?
3. How can you tell isotopes apart?

Explanation:

a) Isotope, one of two or more species of atoms of a chemical element with the same atomic number and position in the periodic table and nearly identical chemical behaviour but with different atomic masses and physical properties.

b) The number indicates the isotope's mass number.

c) Isotopes can be told apart by their mass numbers. Isotopes of the same element have the same quantity of protons in their nuclei.

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