Question

CBSE Important Questions (Short Queztions) for CBSE class10 Science Periodic Classification Of Elements

Answer 1

1. The three elements A, B and C with similar properties have atomic masses X, Y and Z respectively. The mass of Y is approximately equal to the average mass of X and Z. What is such an arrangement of elements called as? Give one example of such a set of elements.
2 . Elements have been arranged in the following sequence on the basis of their increasing atomic masses.
F, Na, Mg, Al, Si, P, S, Cl, Ar, K(a) Pick two sets of elements which have similar properties.(b) The given sequence represents which law of classification of elements?
3. Can the following groups of elements be classified as Dobereiner’s triad ?(a) Na, Si, Cl(b) Be, Mg, Ca

Atomic mass of Be 9; Na 23; Mg 24; Si 28; Cl 35; Ca 40
Explain by giving reason.
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Answer 2

the most important thing in the 5th chapter is that you should know all the advantages disadvantages achievements of all the scientist who studied about the elements and one of the big questions come from Mendeleev periodic table but sometimes other questions may also be put up from other scientist theories