Which set out of them shows the correct sequence of metallic characters?
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Element X forms the chloride with the formula XCl2 ,which is a solid with a high melting point. X is most likely to be in the same group of periodic table as –
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Which of the following, in their outermost shell has 2 valence electrons?
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Which of the following gives the correct order of atomic radii of O, F and N?
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Which out of them has the biggest radii?
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Which will loose electron easily?
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Which of them doesn’t loose electrons easily?
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Arrange the following elements in order of their increasing non metallic character Li,O,C,Be ,F?
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Three elements B,Si and Ge are ___
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Which element was not known when Mendeleev proposed the classification?
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The modern periodic table is given by ____
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The law of octaves is given by ___
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