Smaller First Ionization Energy: Sr or Ru

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Grace Ramey 2K
Posts: 57
Joined: Thu Jul 27, 2017 3:01 am

Smaller First Ionization Energy: Sr or Ru

Postby Grace Ramey 2K » Fri Dec 08, 2017 4:43 pm

I recall coming across a question that asked which element has the smaller first ionization energy, Sr or Ru. For some reason, the answer was Ru, which doesn't follow the periodic trend we learned about. Why is this an exception?

Thanks for your help!

Bansi Amin 1D
Posts: 51
Joined: Fri Sep 29, 2017 7:05 am
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Re: Smaller First Ionization Energy: Sr or Ru

Postby Bansi Amin 1D » Fri Dec 08, 2017 5:36 pm

The experimentally calculated first ionization energy of Ru is approx 710 kJ/mol while the first ionization energy of Sr is approx 550 kJ/mol which does follow the periodic trend.


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