The number of $d-$ electrons in $F{e^{2 + }}$ (at no. of $Fe = 26$) is not equal to that of the
$p - $ electrons in $Ne$ (at. no. $= 10$)
$s -$ electrons in $Mg$ (at. no. $= 12$)
$d - $ electrons in $Fe$
$p -$ electrons in $C{l^ - }$ (at. no. of $Cl = 17$)
Spiegeleisen is an alloy of
Which of the following compound is coloured ?
Which of the following elements is alloyed with copper to form brass
The colour of copper sulphide is
Which of the following will show increase in weight when kept in magnetic field