The elements which have electrons in f orbital are 6 th and 7 th period elements .we know that 6 th period consist of 32 elements, while7 th period consists of 26 elements.6 th period consist of lanthanide series which are 14 in number (from at.no 58 to at.no 71) apart from these there are 18 elements in s,p,d orbital from at.no 55 to at.no 86. in these,elements of at.no 55,56,57 do not contain electron in f orbital. therefore the no of elements having electrons in f orbital in 6 th period will be 32-3=297 th period consists of 26 elements in which 14 are actinides (from at .no 90 to 103), and remaining are from at .no 87 to 112.we need till 110 only so 26-2=24 elements in 7 th period29+24=53 elements contain electrons in f orbital

**Number of Elements with Electron in f Subshell**

The periodic table consists of various elements, each with its own unique properties. The f subshell is one of the electron orbitals within an atom. To determine the number of elements that contain electrons in the f subshell, we need to understand the electron configuration of each element.

**Electron Configuration**

The electron configuration of an atom specifies how the electrons are distributed in its various orbitals. It follows a specific pattern based on the principles of quantum mechanics and the Aufbau principle. The Aufbau principle states that electrons fill the lowest energy orbitals first before moving to higher energy levels.

**f Subshell Electron Configuration**

The f subshell can accommodate a maximum of 14 electrons. It is represented by the letters f, followed by a number indicating the energy level. The f subshell is found in the sixth and seventh rows of the periodic table. The elements that contain electrons in the f subshell are known as the f-block elements or the inner transition metals.

**Elements in the f Subshell**

In the periodic table, there are two series of elements that contain electrons in the f subshell: the lanthanides and the actinides. The lanthanide series consists of 15 elements, with atomic numbers ranging from 57 (lanthanum) to 71 (lutetium). The actinide series consists of 15 elements as well, with atomic numbers ranging from 89 (actinium) to 103 (lawrencium).

**Calculating the Number of Elements in the f Subshell**

To determine the total number of elements that contain electrons in the f subshell, we need to count the elements in both the lanthanide and actinide series.

The lanthanide series contains 15 elements, and the actinide series contains 15 elements, resulting in a total of 30 elements in the f subshell.

Therefore, the number of elements with electrons in the f subshell is 30.

However, the question states that there are 110 elements in total in the periodic table. To find the number of elements that do not contain electrons in the f subshell, we subtract the 30 elements in the f subshell from the total number of elements:

110 total elements - 30 elements in the f subshell = 80 elements without electrons in the f subshell.

Therefore, the number of elements that do not contain electrons in the f subshell is 80.

To find the number of elements that contain electrons in the f subshell, we subtract the elements without electrons in the f subshell from the total number of elements:

110 total elements - 80 elements without electrons in the f subshell = 30 elements with electrons in the f subshell.

Therefore, the correct answer is 30 elements with electrons in the f subshell, not 53 as stated in the question.