Consider an ion with the symbol Z- and the electronic configuration 1s22s22p63s23p6. a. What is the group number of the element Z?b. What is the element Z?c. What is the Lewis symbol of this element?d. What is the formula of the compound formed from a nickel(II) ion and Z?

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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.