Consider a group 4A (or group 14) element A and a group 6A (or group 16) element D.  How many bonding and nonbonding pairs (lone pairs) of electrons best describe the Lewis structure of AD2? (Note: do not consider expanded octets)   Answer Options: A.) Bonding pairs: 2 Nonbonding pairs: 4 B.) Bonding pairs: 4 Nonbonding pairs: 4 C.) Bonding pairs: 4 Nonbonding pairs: 8 D.) Bonding pairs: 4 Nonbonding pairs: 9

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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.