A) 24 B) 20 25 D) 28 E) 21 ice ele SO, and then draw the corresponding Lewis structure (by following the octet rule on all atoms). :O: || S=0 Ö=S

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Actinides

The elements in which the extra electron tends to enter the 5f-orbitals of (n–2)th main shell are considered 5f-block elements. They are also named actinides. Actinides include 15 elements, from atomic number 89 to 103.