Question

identify the Dobereiners triad ​

Answer 1

Answer:

mg,ca,sr is correct answer

Answer 2

$\large{\underline{\underline{Dobereiner's \:\: Triad\:\:is}}}$

$\pink{\underline{\boxed{⟶\:Li , Na , K .}}}$

because Mean of atomic mass of first and third element is equal to atomic mass of second element .

solved answer :

Atomic masses -

Li = 6.9 u . ( element a )

Na = 23 u . ( element b )

K = 39.1 u . ( element c )

Mean of atomic mass of first (a) and third (c) element is equal to atomic mass of second (b) element .

so ,

$⟶\:Mean\:=\:\:\frac{a\:+\:c}{2}$

$⟶\:Mean\:=\:\:\frac{6.9\:+\:39.1}{2}$

$⟶\:Mean\:=\:\:\frac{46}{2}$

$⟶\:Mean\:=\:23\:$

as per dobereiner's Triad mean of atomic mass of first and third element is equal to atomic mass of second element .

so , here

Mean of atomic mass of atomic mass of first and third element is equal to atomic mass of second element .

i.e → 23 u = 23 u .

option correct is "1" .

$\huge\orange{\underline{\underline{I\:hope\:it\:helps\:you.}}}$