Question

Which elements are out of order in terms of atomic mass. co,Ni or Li,be or I,xe​

Answer 1

The pair co,Ni is out of order in terms of atomic mass

Step-by-step explanation:

For co,Ni

Atomic mass of Co = 58.9331 u

Atomic mass of Ni = 58.6934

For Li,be

Atomic mass of Li = 6.941 u

Atomic mass of be = 9.012182 u

For I,xe

Atomic mass of I = 126.90447 u

Atomic mass of Xe = 131.293 u

Hence, the pair co,Ni is out of order in terms of atomic mass