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Chemistry - Periodic Classification Of Elements

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66. An element has electronic configuration 2, 8, 4. It belong to which group and period of the Modern Periodic Table (NTSE Chhattisgarh, Stage-I, 2016-17)

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67. Elements belonging to different groups of the Modern Periodic Table are iven below. If the element X forms a chloride whose formula is 'XCI2' then such 'X' belongs to the group whose representative element is

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68. Identify the trend of elements along a group of the Modern Periodic Table shown below.
a. The electropositive character of elements decreases.
b. The electronegative character of elements increases. (NTSE Karnataka, Stage-I, 2016-17)

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69. Which of the following represents the sequence in which the given  ompounds are arranged in the increasing order of the electronegative difference of their component elements?
CH4, NaCI, CO, Na20, MgCI2 (NTSE Kerala, Stage-I, 2016-17)

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70. Which of the following represents pairs of metalloids? (a) Si & Sb (b) Pb & Sb (c) Ru & Rh (d) Ge & As (NTSE Kerala, Stage-I, 2016-17)

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Periodic Classification Of Elements