please help 4. Using the periodic table electron configuration, account for the

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please help

4. Using the periodic table electron configuration, account for the stability of the lanthanide ions Ce4 and Eu2+ Each of these ions is stable. Explain why each is stable separately A. Ce4+ Acan res +4 oxidation state because in this st de, cerium is ? stable Conguectton B. Eu2 Ca 2 5. Answer each of the following questions A. What is the periodic Law and how does it relate to electron configuration. In your explanation, alkaline earth metals as an example. avins SI period!??aw, states that groupmanas nt ade hanna s

Explanation / Answer

4.

(a)

Ce4+ ( Z = 58) E.C is 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 4f0 5d0 6s0

(OR) [Xe] 4f0 5d0 6s0

So, it has the noble Xe element configuration and hence is more stable.

(b)

Eu2+ ( Z = 63 ) E.C is 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 4f7 6s0

(OR) [Xe] 4f7 6s0

It has half filled f - subshell and hence is more stable.

5.

Periodic law :

The properties of elements are the periodic functions of their atomic number.

As we arrange the elements by increasing their atomic number the element with similar outer electronic configuration will come under same group which exhibits similar properties.

For: Alkaline earth metals have the general valence shell electronic configuration as ns2

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