Solder is an alloy of
$70\%$ lead, $ 30\%$ tin
$30\%$ lead, $70\%$ tin
$80\%$ lead, $20\%$ tin
$90\%$ $Cu, 10\%$ tin
All the following statements about the transitional elements are true except that
Which of the following has '$6$' unpaired $f-$electrons ?
The most malleable of all the metals is
Four successive members of the first row transition elements are listed below with their atomic numbers. Which one of them is expected to have the highest third ionization enthalpy