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KUMAR PRAKASHAN-PERIODIC CLASSIFICATION OF ELEMENTS-OBJECTIVE QUESTIONS AND ANSWERS (State whether the following statements are true or false : )
- At present, naturally occurring elements are 98.
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- The atomic masses of elements form a Dobereiner's triad are 14 u, 31 u...
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- Calcium, strontium and barium form a Dobereiner's triad.
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- According to the Newlands law of octaves, every eighth element had pro...
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- Sodium is the eighth element after lithium.
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- Oxygen is the eighth element after sulphur.
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- Phosphorus is the eighth element after nitrogen.
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- Dobereiner's triads are observed in Newlands' octaves.
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- Mendeleev's periodic law was based on atomic number of elements.
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- Molecular formula of oxide of barium is Bao.
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- Mendeleev named gallium for eka-silicon.
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- An element having atomic number 3.5 can be placed between Be and B.
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- There are three valence electrons present in the elements of group I.
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- Electrons are filled in K, L and M shells in the elements of the third...
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- Each period starts with the filling of electrons in a new shell.
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