Q25 of 59 Page 32

All transition elements are d-block elements, but all d-block elements are not transition elements. Explain.

Those elements which have their outermost electrons in the d orbitals are known as d block elements. But to be a transition element it is important to have an incompletely filled d orbital of the element or their respective ions. For example, zinc, cadmium and mercury.


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23

In the following questions two or more options may be correct.

An element belongs to 3rd period and group-13 of the periodic table. Which of the following properties will be shown by the element?


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Explain why the electron gain enthalpy of fluorine is less negative than that of chlorine.

 26

Identify the group and valency of the element having atomic number 119. Also predict the outermost electronic configuration and write the general formula of its oxide.

 27

Ionisation enthalpies of elements of second period are given below : Ionisation enthalpy/ k cal mol–1 : 520, 899, 801, 1086, 1402, 1314, 1681, 2080.

Match the correct enthalpy with the elements and complete the graph given in Fig. 3.1. Also write symbols of elements with their atomic number