Advertisements
Advertisements
प्रश्न
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.
उत्तर
- For set a, even though silicon's atomic mass is similar to the arithmetic mean of the atomic masses of sodium and chlorine. The physical properties of the elements are not similar. Hence, sodium, silicon and chlorine are not dobereiner's triad.
- For set b, if the arithmetic mean of the atomic masses of beryllium and calcium is taken it is similar to the atomic mass of magnesium and the physical properties of the three elements are similar. So, Beryllium, magnesium and calcium can be classified as dobereiner's triad.
APPEARS IN
संबंधित प्रश्न
Name the scientist who gave Law of triads in the early classification of elements.
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.
What is Debereiner's law of triads? Explain with the help of one example of a Dobereiner's triad.
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)
In Dobereiner’s triad containing Li, Na, K, if atomic masses of Lithium & Potassium are 6.9 and 39.1, then what will be the atomic mass of Sodium?
Can the following groups of elements be classified as Dobereiner's triad:
Na, Si, Cl
Atomic mass of Na - 23, Si - 28, Cl - 35.
Justify your answer.
Write the characteristic of Dobereiner’s triads?
According to Dobereiner’s triads rule, three elements in an increasing order of atomic mass shows _______.
In Dobreiner's triads, three elements appear to be arranged in ascending order of their atomic number.
Match the following.
| 1. | Triads | Newlands |
| 2. | Alkali metal | Calcium |
| 3. | Law of octaves | Henry Moseley |
| 4. | Alkaline earth metal | Sodium |
| 5. | Modern Periodic Law | Dobereiner |
