Advertisements
Advertisements
प्रश्न
State one example of a Dobereiner's triad, showing in it that the atomic mass of middle element is half-way between those of the other two.
उत्तर
Lithium (Li), sodium (Na) and potassium (K) with atomic masses 7, 23, 39 constitute a Dobereiner's triad. The atomic mass of sodium (middle element) is half-way between those of the other two. This can be seen in the illustration below:
Average of the atomic masses of lithium and potassium =
APPEARS IN
संबंधित प्रश्न
Did Dobereiner’s triads also exist in the columns of Newlands’ Octaves? Compare and find out.
The arrangement of elements in a group of three is known as ________.
Name the scientist who gave Law of triads in the early classification of elements.
Can the following groups of elements be classified as Dobereiner's triads?
(a) Na, Si, Cl
(b) Be, Mg, Ca
Give reason for your answer.
(Atomic masses : Be 9 ; Na 23 ; Mg 24 ; Si 28 ; Cl 35.5 ; Ca 40)
Did Dobereiners triads also exist in the columns of Newland's Octaves? Compare and find out.
Dobereiner laid down the _______ rule.
According to Dobereiner’s triads rule, three elements in an increasing order of atomic mass shows _______.
State Dobereiner’s Law of Triads.
In Dobereiner’s triads, the atomic weight of the middle element is ______ the of the atomic masses of 1st and 3rd elements.
Can the following groups of elements be classified as Döbereiner's triad?
- Na, Si, Cl
- Be, Mg, Ca
Atomic mass of Be 9; Na 23; Mg 24; Si 28; Cl 35; Ca 40 Explain by giving reason.
