Which element of Group 17 has two isotopes of masses 35 and 37 amu with an average abundance of 75.77% and 24.23%, respectively?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is Option 1 i.e. Chlorine.
The chlorine (Cl) element in group 17 has two isotopes with masses of 35 and 37 amu, which have average atomic masses of 35 amu and 37 amu, respectively.
The average atomic mass is a weighted average of these isotopes based on their natural abundance in the Earth's crust.
Chlorine-35 (Cl-35) has an average abundance of 75.77%.
Chlorine-37 (Cl-37) has an average abundance of 24.23%.
The average atomic mass is calculated as follows: (0.7577 × 35) + (0.2423 × 37) = 35.4846.