30. Fill in the blanks with the appropriate word/s in each case. 1. Periods are [5, 6, 7] horizontal rows of elements in the periodic tab electron shells and two electrons in its valence shell belongs to period 2. Across a period the valence electrons [remain same/increase by 1]. Across a period, the electropositive character and down character [increases/decreases] 3.
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1. Periods are long [5, 6, 7] horizontal rows of elements in the periodic table and an element with three electron shells and two electrons in its valence shell belongs to period 3 [6, 3, 1] and group 2 [3, 6, 2].
2. Across a period the valence electrons increase by 1 while down a subgroup they remain same.
3. Across a period, the electropositive character decreases and down a group the electronegative character decreases.
4. Elements at the extreme left of the modem periodic table are most reactive, while elements on the extreme right [group 18 (0)] are un reactive.
5. Elements of group 1 [IA] are strong reducing [oxidising / reducing] agents since they are electron donors [acceptors/ donors].
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