Which of the following forms the most stable gaseous negative ion?
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The reduction in atomic size with increase in atomic number is a characteristic of elements of-
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Which of the following sequence correctly represents the decreasing acidic nature of oxides ?
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The electronic configuration of an element is 1s², 2s² 2p6, 3s² 3p³. What is the atomic number of the element which is just below the above element in the periodic table
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In the modern periodic table , the period indicates the value of:
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Which of the following elements are found in pitch blende?
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Arrange S, O and Se in ascending order of electron affinity
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In the modern periodic table, the period indicates the value of
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Representative elements are those which belong to
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Q. Diagonal relationship is shown by A. All elements with their diagonally downward elements towards right B. Most of the elements of second period ...
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The group number, number of valence electrons, and valency of an element with the atomic number 15, respectively, are:
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On the Pauling’s electronegativity scale the element next to F is
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