Which among the following is not true about modern periodic table (a) group number of an element gives an idea of the numbers of its valence electrons (b) non metals are present towards the right side of the periodic table (c) hydrides of the elements in the first group will have a similar formula (d) oxides of elements in the first period will have a similar formula

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Solution

the only wrong statement among the following is statement D
(d) oxides of elements in the first period will have a similar formula

because the elements with same valency and valence electrons are arranged in groups not periods . so oxides formed by elements in a group will have similar formula not period.

all other statements are correct

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