In Mendeleev’s periodic table some pairs of elements do not follow increasing order of atomic weight known as anomalous pair. The correct example of anomalous pair is

Question

In Mendeleev’s periodic table some pairs of elements do not follow increasing order of atomic weight known as anomalous pair. The correct example of anomalous pair is (A) Cl, Ar (B) Th, Pa (C) Te, In (D) Co, Nb

Tardigrade Admin · Accepted Answer

Atomic weight of Th = 232 Atomic weight of Pa = 231

Q. In Mendeleev’s periodic table some pairs of elements do not follow increasing order of atomic weight known as anomalous pair. The correct example of anomalous pair is

$Cl, A r$

$T h, P a$

$T e, I n$

$C o, N b$

Atomic weight of $T h = 232$
Atomic weight of $P a = 231$

Q. In Mendeleev’s periodic table some pairs of elements do not follow increasing order of atomic weight known as anomalous pair. The correct example of anomalous pair is

Cl,Ar

Th,Pa

Te,In

Co,Nb

Atomic weight of Th=232 Atomic weight of Pa=231

$Cl, A r$

$T h, P a$

$T e, I n$

$C o, N b$

Atomic weight of $T h = 232$
Atomic weight of $P a = 231$