Which of the following pairs of atomic symbols representisotopes? a.^235 U and ^238 U b. P4 andP8 c. ^32P and ^83Pb d. ^50Sn and ^51Sb The atomic symbol for Beryllium, ^9 lower 4Be, indicates thatthe _____. a. atomic number is 4 b. atomic number is9 c. mass number is 4 d. atomic number is9-4 Which of the following pairs of atomic symbols representisotopes? a.^235 U and ^238 U b. P4 andP8 c. ^32P and ^83Pb d. ^50Sn and ^51Sb The atomic symbol for Beryllium, ^9 lower 4Be, indicates thatthe _____. a. atomic number is 4 b. atomic number is9 c. mass number is 4 d. atomic number is9-4
Explanation / Answer
Isotopes: The atoms which have same atomic number anddifferent atomic masses called them isotopes. So to given all pairs a) .^235 U and ^238 U is the isotopic pair. hence option a) is the correct answer. Beryllium, ^9 lower 4Be idicates that 4 is the atomicnumber of Be and 9 is the atomic mass of Be . hence option a) is the correct answer.