Question Number 31863 by Tinkutara last updated on 16/Mar/18
Commented by rahul 19 last updated on 16/Mar/18
$$\left(\mathrm{3}\right)\:? \\ $$
Commented by Tinkutara last updated on 16/Mar/18
�� but why?
Commented by Tinkutara last updated on 16/Mar/18
But how 3rd is correct? In which book I can read this explanation?
Commented by rahul 19 last updated on 16/Mar/18
$${the}\:{only}\:{thing}\:{which}\:{comes}\:{to}\:{my}\: \\ $$$${mind}\:{after}\:{seeing}\:'{d}'\:{is}\:{lanthanide}\:{contraction}. \\ $$
Commented by Tinkutara last updated on 16/Mar/18
But why not 2nd? In a group this condition holds.
Commented by rahul 19 last updated on 16/Mar/18
$${i}\:{choose}\:{more}\:{appropriate}\:{option}. \\ $$$${and}\:{yes}\:{we}\:{already}\:{know}\:\left(\mathrm{2}\right)\:{option} \\ $$$${and}\:{that}'{s}\:{how}\:{the}\:{periodic}\:{table} \\ $$$${is}\:{made}\:! \\ $$
Commented by rahul 19 last updated on 16/Mar/18
$${that}'{s}\:{present}\:{in}\:{jd}\:{lee}\:{i}\:{think}. \\ $$
Commented by Tinkutara last updated on 16/Mar/18
Do you know where in it?
Commented by rahul 19 last updated on 16/Mar/18
$${i}\:{am}\:{not}\:{sure}\:{thou}. \\ $$$${even}\:{i}\:{have}\:{to}\:{check}.\:{actually}\:{it}\:{was} \\ $$$${told}\:{by}\:{my}\:{teacher}\:{when}\:{we}\:{were} \\ $$$${doing}\:{periodic}\:{classification}. \\ $$