Radioactive elements

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Manav Govil 1B
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Joined: Sat Sep 07, 2019 12:19 am

Radioactive elements

Postby Manav Govil 1B » Wed Oct 23, 2019 1:22 pm

Why don't we compare the periodic trends for radioactive elements? For example, according to the trends, Francium should have a larger atomic radius than Caesium, but we don't mention Francium or any other group 7 elements for that matter. Also, how do we compare the trends for the Lanthanoids and actinoids?

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Re: Radioactive elements

Postby Chem_Mod » Wed Oct 23, 2019 2:29 pm

We mostly don't discuss many f block elements (or anything low on the periodic table) because they are not very relevant to the life sciences. They don't occur naturally in the human body or other living things. However, we can still apply the concepts of periodic trends to the lanthanides and actinides. The atomic radius still decreases going across a row in the lanthanides but in a much more pronounced way, known as the lanthanide contraction.

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