Advertisements
Advertisements
प्रश्न
A, B and C are the elements of a Dobereiner's triad. If the atomic mass of A is 7 and that of C is 39, what should be the atomic mass of B?
उत्तर
At. wt. of A = 7, At. wt. of C = 39
At wt. of B = `("At.wt. of A + At. wt. of C")/2 = (7 + 39)/2 = 23`
At. wt. of B = 23
i.e Average of weights of A and C.
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 ________.
The modern periodic table has been evolved through the early attempts of Dobereiner, Newland and Mendeleev. List one advantage and one limitation or all the three attempts.
Name the scientist who gave Law of triads in the early classification of elements.
The three imaginary elements X, Y and Z represent a Dobernener's triad. If the atomic mass of element X is 14 and that of element Y is 46, then the atomic mass of element Z will be:
(a) 28
(b) 60
(c) 78
(d) 72
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?
Did Dobereiners triads also exist in the columns of Newland's Octaves? Compare and find out.
Explain why Dobereiner’s method of classification of elements did not hold much weightage for future classification.
Dobereiner laid down the _______ rule.
In Dobreiner's triads, three elements appear to be arranged in ascending order of their atomic number.
