From: Olasunkanmi Lukman Olawale
<walecomuk||yahoo.co.uk>
Subject: CCL: Periodic table of elements
Date: Thu, 8 Dec 2011 17:38:27 +0000 (GMT)
I don't really get your first
question. But transition metals/elements have partially filled d-orbitals,
except for element like Zn which is a d10 element but categorized as a
transition metal.
valence electrons are electrons in
the outermost shell. For Ge you wrote 4s2 3d10 4p2. the outermost shell is shell
4 (n = 4), thus, outermost (valence) electrons are the ones on 4s and 4p (=2 +
2)=4. That is why Ge is a group IV
element.
Olasunkanmi Lukman Olawale Current
Address: Department of Chemistry, Obafemi Awolowo
University, Ile-Ife, Osun State. Nigeria.
+234-0-80-52401564 Or +234-0-80-67161091
From: bonoit bonoit bonoit_10/./yahoo.fr
<owner-chemistry~!~ccl.net> To: "Olasunkanmi, Olawale Lukman "
<walecomuk~!~yahoo.co.uk> Sent: Tuesday, 6 December 2011, 23:42 Subject: CCL: Periodic table of
elements
Sent to CCL by: "bonoit bonoit"
[bonoit_10()yahoo.fr] Dear CClers,
i have some questions about the
Periodic table of elements; 1-Is the formulae ns2 (n-1)dx (x inferior or
equal to 8)correct for determining the transition elements?
2-Whay, when
we an electronic configuration like 4s2 3d10 4p2 (valence electron for Ge), we
mention 3d10 as valence electron and in this case we have only 4s2 4p2? what is
the reason for excluding 3d10?
Thank you in
advance Sincerely, Bonoit
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