Rutherford’s alpha particle scattering experiment led to the discovery of
The mass number of two atoms X and Y is the same (40 each)but their atomic number are different (being 20 and 18, respectively). X and Y are examples of
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For an element Z = 9. The valency of this element will be
The correct electronic configuration of chloride ion is
Almost the entire mass of an atom is concentrated in the
Which of the air pressures is appropriate for the production of cathode rays in the discharge tube?
There are four elements P, Q, R and S having atomic numbers of 4, 18, 10 and 16, respectively. The element which can exhibit covalency as well as electrovalency will be
Four elements W, X, Y and Z contain 8, 11, 9 and 17 protons per atom respectively. The element which cannot form an anion is most likely to be
20 videos|55 docs|52 tests
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20 videos|55 docs|52 tests
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