Thursday, January 12, 2012

How many shell or orbits do the elements have in the first periodic? And how many shells in second period?

Also The Alkaline Earth metals are supposed to be reactive. what does this mean?

How many shell or orbits do the elements have in the first periodic? And how many shells in second period?
In period 1, one orbital, 1s, in period 2, three orbitals, 1s, 2s, 2p.



The reactivity of the Alkaline earth metals refers to how readily they react with water and other elements. It should be noted that the Alkali metals (group 1) are more reactive than the Alkaline earths (group 2).


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