9. Draw an electron dot diagram to illustrate the bonding for a molecule of H₂O. 10. Identify the name of the elements in the following locations on the periodic table: a) b) d) Group 14 (IV A), Period 2 Group 11 (IB), Period 4 Group 18 (VIII A), Period 6 Group 1 (IA), Period 1 ●

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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.