How do you identify a pair of isotopes? Also, what are isotopes?

Isotopes are elements with same atomic number but different mass number. Hydrogen and Deuterium are isotopes with same atomic number but different mass number. Hydrogen have atomic number 1 and mass number 1 where as deuterium have atomic number 1 but mass number 2

away from the curb

explanation:

the wheels would then hit the curb if it started to rolling, decreasing the chance of an accident.

let that person have a turn to speak : )