Trying to figure out what these elements have in common [closed]








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I have an old periodic table and I marked five metals from groups 1A and 2A with dots to indicate something about them. Only all this time later I can't figure out what exactly it was. I've been trying to figure it out for ages. 


The elements are: Li, Na, K, Ca, Ba. 


Doesn't anyone know any properties that just those elements, or maybe even just primarily those five, share that I could have been marking them for? 




They are all member of the s block in the periodic table. It means they all have valence electron in the s orbital. 


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