Question

merits of mendleev periodic table​

Answer 1

i) Give more weight to similarities in properties than to atomic mass in the arrangement. ...

ii) Correction of atomic mass. ...

iii) Prediction of new elements. ...

iv) Noble gases were discovered much later.

He named them Eka-Boron, Eka-Aluminium and Eka-silicone He also predicted the properties of these undiscovered elements including atomic masses. These elements were discovered as Sc ,Ga and Ge with same features as he predicted. 4. Mendeleev's arrangement helped to correct atomic masses of a number of elements.

Answer 2

$\red{\bigstar}\underline{\underline{\textsf{\textbf{ merits \: of \: mendeléev \: periodic \: table :- }}}}$

$\leadsto$ Some Merits of Mendeléev Periodic table are as follows :-

• Correction of Atomic Mass :- Atomic Masses of done elements were revised by mendeléev . He revised the Atomic mass of berryllium (14.9) has changed to 9.4

• Vacant Space :- In Mendeléev periodic table , he make some vacant space which was convinient for elements which were going to discover in future and name them as a Sanskrit Numeral "Eka" (One). Example Eka-boron , Eka-Aluminium , Eka-Silicon . Later on After their discovery they were named as -:

• Eka -Boron - Scandium
• Eka - Aluminum - Gallium
• Eka - Silicon - Germanium

• Prediction of noble Gases - At the time of Mendeléev Noble gases were not discovered but he predict and made an Extra Group called "Zero Group" for Noble gases to be fitted .

_________________________

$\red{\bigstar}\underline{\underline{\textsf{\textbf{Dimitri \: Ivanovich \: Mendeléev \: (1834 - 1907) :- }}}}$

${\sf{\small{{\red{Dimitri \: Ivanovich \: Mendeléev \: was \: born \: in \: }}}}}$

${\sf{\small{{\red{in \: western \: siberia ,\: Russia \: on \: 8 \: February \: 1834.\: \: }}}}}$

${\sf{\small{{\red{After \: his \: early \: education \: Mendeléev \: could \: }}}}}$

${\sf{\small{{\red{join \: a \: university \: only \: due \: to \: efforts \: of \: his \: }}}}}$

${\sf{\small{{\red{mother. \: Dedicating \: his \: investigation \: to \: his \: \: }}}}}$

${\sf{\small{{\red{mother \: he \: wrote, \: "she \: instructed \: with \: }}}}}$

${\sf{\small{{\red{example \: corrected \: with \: love \: and \: travelled \: }}}}}$

${\sf{\small{{\red{with \: me \: spending \: her \: last \: resources \: and \: }}}}}$

${\sf{\small{{\red{strength. \: she \: knew \: that \: with \: the \: aid \: of \: }}}}}$

${\sf{\small{{\red{science \: without \: violence \: with \: love \: but \: firmness}}}}}$

${\sf{\small{{\red{,all\: superstition\:untruth\:and\:erorrs\:can\:be\:removed"}}}}}$

${\sf{\small{{\red{The \:arrangements \: of \: elements \: he \: proposed \: is }}}}}$

${\sf{\small{{\red{is \: called \: Mendeléev's\:periodic \: table. \: the \: periodic }}}}}$

${\sf{\small{{\red{table \: proved \: to \: be \: unifying \: principle \: in \: }}}}}$

${\sf{\small{{\red{chemistry .\: it \: was \: the \: motivation \: of \: the \:}}}}}$

${\sf{\small{{\red{discovery \: of \: some \: new \: elements \: }}}}}$