Question

Are there any elements whose atomic number is greater than its group number on the periodic table (except hydrogen)? If yes, then what are they called and how many such elements exist?

Answer 1

Yes, there are elements whose atomic number is greater than their group number on the periodic table. These elements are known as "transition elements" or "transition metals." Transition elements are found in the d-block of the periodic table, and their electrons fill the d orbitals.

The transition elements include elements from group 3 to group 12, excluding helium, which is not a transition element. Therefore, there are a total of 10 transition elements. Here is a list of the transition elements along with their atomic numbers:

1. Scandium (Sc) - Atomic number 21
2. Titanium (Ti) - Atomic number 22
3. Vanadium (V) - Atomic number 23
4. Chromium (Cr) - Atomic number 24
5. Manganese (Mn) - Atomic number 25
6. Iron (Fe) - Atomic number 26
7. Cobalt (Co) - Atomic number 27
8. Nickel (Ni) - Atomic number 28
9. Copper (Cu) - Atomic number 29
10. Zinc (Zn) - Atomic number 30

These elements are called transition elements because their electron configurations involve filling the d orbitals. Their chemical properties and behavior are unique due to the presence of partially filled d orbitals, which results in various oxidation states, colorful compounds, and good catalytic activity.