In a triad of three elements A, B, and C, the atomic mass of A and B are 80 and 120 respectively. Find the atomic mass of element C. 

Explanation

Given : Mass of `A = 80 ,` Mass of B = 120 , Mass of C = ?
Using law of traids ,
`B = (A + C)/2 implies 120 = (80 + C)/(2)`
`80 + C = 120 xx 2 = 240`
`C = 240 - 80 = 160`.
Hence , atomic mass of element C is 160.