Question

The atomic number of an element is 71. is this element diamagnetic or paramagnetic?

Answer 1

Answer:

Paramagnetic

Explanation:

Paramagnetic are those which has unpaired electrons and diamagnetic are those in which all electrons are paired.

Given the atomic number - 71

The electronic configuration is -  

$1s^22s^22p^63s^23p^63d^{10}4s^24p^64d^{10}5s^25p^64f^{14}5d^16s^2$

The electron in 5d orbital = 1

This 1 electron will be unpaired as electron is first singly filled.

Thus, the element is paramagnetic as the electron is unpaired.

Answer 2

The  element  with atomic  number  71(lutetium) is  paramagnetic

  This  is  because  all  its   electrons   is  not  paired .  lutetium  has  electron  configuration  of  (Xe) 4f^14 5d^1 6S^2
Its 5d   sub shell  is  not  paired  since  the  d  sub shell  can  accommodate  a total  of  10   electrons  hence  lutetium  is  paramagnetic