Number of Transition Elements in Modern Periodic Table

There are various elements present in the modern periodic table, but the transition elements are the ones that lie in the center of the table. These elements have partially filled d orbitals in their atoms and can form one or more stable ions with different charges.

Definition of Transition Elements

Transition elements are those elements that have partially filled d orbitals in their atoms. These elements can form one or more stable ions with different charges as they lose or gain electrons from their d orbitals.

Counting the Number of Transition Elements

There are 118 known elements in the modern periodic table. Out of these, the transition elements lie in the d-block of the periodic table. The d-block itself contains 10 columns, starting from column 3 to column 12. Therefore, the number of transition elements in the modern periodic table is:

Number of Transition Elements = Number of Elements in d-Block
= Number of Columns in d-Block
= 12 - 3 + 1
= 10

Therefore, the correct answer is option B) 38.

Conclusion

The modern periodic table contains 10 columns in the d-block, which represents the transition elements. These elements have partially filled d orbitals in their atoms and can form one or more stable ions with different charges. The number of transition elements in the modern periodic table is 38.

D block elements are 40 but zinc, cadmium and mercury are not considered transitional elements therefore transition elements are 37