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Try this! - Atomic Structure - BITSAT

Element with electronic configuration 1s^{2}, 2s^{2}, 2p^{6}, 3s^{2}3p^{6}3d^{10},4s^{2}4p^{6}4d^{10}, 5s^{2}5p^{3} belongs to which group of the periodic table?

  • Option 1)

    3rd

  • Option 2)

    15th

  • Option 3)

    7th

  • Option 4)

    2nd

 
Answers (1)
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As we learnt in 

Aufbau Principle -

In the ground state of the atoms, the orbitals are filled in order of their increasing energies.

- wherein

 

 Given configuration: 1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{10}4s^{2}4p^{6}4d^{10}5s^{2}5p^{3}

Element of the above configuration belongs in p block and for p block elements, group no = valence electrons +10

                                                                                                                                                   = 5+10 = 15


Option 1)

3rd

Option 2)

15th

Option 3)

7th

Option 4)

2nd

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