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In the modern periodic table, elements a...

In the modern periodic table, elements are arranged in order of increasing atomic numbers, which is related to the electornic configuration. Depending upon the type of orbitals receiving the last electron, the elements in the periodic table have been divided into four blocks, s, p,d and f. The modern periodic table consists of 7 periods and 18 groups. Each period begins with the filling of a new energy shell. in accordance with the Aufbau principal, the seven periods (1 to 7) have 2,8,8,18,18,32 and 32 elements respectively. The seventh period is still incomplete. To avoid the periodic table being too long, the two series of f-block elements, called lanthanoids and actinoids, are placed at the bottom of the main body of the periodic table
The element with atomic number 57 belongs to

A

s-block

B

p-block

C

d-block

D

f-block

Text Solution

AI Generated Solution

The correct Answer is:
To determine which block the element with atomic number 57 belongs to, we can follow these steps: ### Step-by-Step Solution: 1. **Identify the Atomic Number**: The atomic number given is 57. 2. **Determine the Electronic Configuration**: - We know that the electronic configuration of elements is based on the Aufbau principle, which states that electrons fill orbitals starting from the lowest energy level to the highest. - The first 54 electrons correspond to the noble gas Xenon (Xe), which has an atomic number of 54. 3. **Write the Electronic Configuration of Xenon**: - The electronic configuration of Xenon (Xe) is: \[ \text{Xe} = [Kr] 4d^{10} 5s^2 5p^6 \] - Here, [Kr] represents the configuration of Krypton (atomic number 36). 4. **Add the Remaining Electrons**: - Since we are looking for the configuration of the element with atomic number 57, we need to add 3 more electrons to the configuration of Xenon. - The next orbitals to fill after Xenon are 6s, 4f, and 5d. 5. **Fill the Orbitals**: - The filling order after Xenon would be: - 6s (2 electrons) - 4f (1 electron) - Therefore, the electronic configuration for the element with atomic number 57 (Lanthanum) will be: \[ \text{Configuration} = [Xe] 6s^2 4f^1 \] 6. **Determine the Block**: - The last electron added is in the 4f orbital. - Elements that have their last electron in the f orbital belong to the f-block. ### Conclusion: The element with atomic number 57 belongs to the **f-block** of the periodic table.
To determine which block the element with atomic number 57 belongs to, we can follow these steps: ### Step-by-Step Solution: 1. **Identify the Atomic Number**: The atomic number given is 57. 2. **Determine the Electronic Configuration**: - We know that the electronic configuration of elements is based on the Aufbau principle, which states that electrons fill orbitals starting from the lowest energy level to the highest. ...
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In the modern periodic table, elements are arranged in order of increasing atomic numbers, which is related to the electornic configuration. Depending upon the type of orbitals receiving the last electron, the elements in the periodic table have been divided into four blocks, s, p,d and f. The modern periodic table consists of 7 periods and 18 groups. Each period begins with the filling of a new energy shell. in accordance with the Aufbau principal, the seven periods (1 to 7) have 2,8,8,18,18,32 and 32 elements respectively. The seventh period is still incomplete. To avoid the periodic table being too long, the two series of f-block elements, called lanthanoids and actinoids, are placed at the bottom of the main body of the periodic table The elements with atomic numbers 35,53 and 85 are all

In the modern periodic table, elements are arranged in order of increasing atomic numbers, which is related to the electornic configuration. Depending upon the type of orbitals receiving the last electron, the elements in the periodic table have been divided into four blocks, s, p,d and f. The modern periodic table consists of 7 periods and 18 groups. Each period begins with the filling of a new energy shell. in accordance with the Aufbau principal, the seven periods (1 to 7) have 2,8,8,18,18,32 and 32 elements respectively. The seventh period is still incomplete. To avoid the periodic table being too long, the two series of f-block elements, called lanthanoids and actinoids, are placed at the bottom of the main body of the periodic table Which of the element whose atomic numbers are given below, cannot be accommodated in the present set up of the long form of the periodic table ?

Knowledge Check

  • In the modern long form of the periodic table, elements are arranged in the increasing order of

    A
    Atomic mass
    B
    Atomic number
    C
    Mass number
    D
    Metallic character.

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