n14. An element of atomic weight Z consists of two isotopes of massmum

1.	n14. An element of atomic weight Z consists of two isotopes of massmumber 1and Z +2. Percentage abundance ofthe heavier isotope isA) 25B) 33.33C) 66.66D) 75
Answer» Abundance of an isotope can be calculated as follows : Let abundance of isotope with atomic mass Z+2 is xThen abundance of isotope Z-1 is 1-x (Z+2) x + (Z-1)(1-x) = ZSolving we getx=1/3Therefore abundance of Z+2 is = (1/3)*100=33.33 %And abundance of Z-1 is = 1-33.33 =67.66 % Therefor isotope with atomic mass Z-1 is higher in % abundance. 66.66%

n14. An element of atomic weight Z consists of two isotopes of massmumber 1and Z +2. Percentage abundance ofthe heavier isotope isA) 25B) 33.33C) 66.66D) 75

Answer»

Abundance of an isotope can be calculated as follows :

Let abundance of isotope with atomic mass Z+2 is xThen abundance of isotope Z-1 is 1-x

(Z+2) x + (Z-1)(1-x) = ZSolving we getx=1/3Therefore abundance of Z+2 is = (1/3)*100=33.33 %And abundance of Z-1 is = 1-33.33 =67.66 %

Therefor isotope with atomic mass Z-1 is higher in % abundance.

66.66%