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By Expert Faculty of Sri Chaitanya

Ce3+ can be easily oxidized to Ce4+

Chemical properties of all the lanthanoids are quite similar.

Gd3+ and Lu3+ are stable.

La4+ exists.

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(1) Ce=4f15d16s2,Ce+3=4f15d06s0 (2) The valence shell configuration of Ln is the same since e-'s enters into the inner 4f subshell. Moreover, due to Ln contraction, the change in the size of Ln is very small. Therefore, their chemical properties are similar (3) Gd(Z=64):4f75d16s2,Gd3+=4f7Lu(Z=71):4f145d16s2,Lu+3=4f14Due to half filled and full filled stable configuration, they are stable (4) La(Z=57):5d16s2,La3+=5d06s0To obtain +4 O.S. state, the stable configuration is to be disturbed which is not possible. Henc La+4 does not exist.

Similar Questions

This section contains questions each with two columns-I and II. Match the items given in column I with that in column II.

	Column I		Column II
a.	Ni	p.	Elements having same number of unpaired electron in their dispositive in column I
b.	Na	q.	At least 13 electrons are having magnetic quantum number 'zero'
c.	Mn	r.	Atom is paramagnetic
d.	Pd	s.	Element is not transition element
		t.	Element having pseudo inert gas configuration in its dispositive cation