In the fourth period of the periodic table,ho | vedclass

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(C) The fourth period of the periodic table corresponds to the filling of the $4s$,$3d$,and $4p$ orbitals. Elements in the fourth period have valence

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(C) The fourth period of the periodic table corresponds to the filling of the $4s$,$3d$,and $4p$ orbitals. Elements in the fourth period have valence electrons in the $n=4$ shell and the $3d$ subshell. Since the $4d$ subshell only begins to fill in the fifth period (starting with Yttrium,$Z=39$),there are no elements in the fourth period that possess $4d$ electrons. Therefore,the number of such elements is $0$.

List-$I$	List-$II$
$A$. (Atomic number,$Z = 112$)	$I$. $s$
$B$. (Atomic number,$Z = 116$)	$II$. $p$
$C$. (Atomic number,$Z = 88$)	$III$. $d$
$D$. (Atomic number,$Z = 100$)	$IV$. $f$

In the fourth period of the periodic table,how many elements have one or more $4d$ electrons?

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Match the following:
List-$I$ List-$II$
$A$. (Atomic number,$Z = 112$) $I$. $s$
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