With reference to the elements of the modern periodic table.Fill in th

1.	With reference to the elements of the modern periodic table.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 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 ............ while down a subgroup they..........3. Across a period, the electropositive character............ and down a group the electronegative character .............4. Elements at the extreme left of the modem periodic table are ....... reactive, while elements on the extreme right [group 18 (0)] are ....... reactive.5. Elements of group 1 [IA] are strong .......... [oxidising / reducing] agents since they are electron ............. [acceptors/ donors].
Answer» 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].

With reference to the elements of the modern periodic table.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 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 ............ while down a subgroup they..........3. Across a period, the electropositive character............ and down a group the electronegative character .............4. Elements at the extreme left of the modem periodic table are ....... reactive, while elements on the extreme right [group 18 (0)] are ....... reactive.5. Elements of group 1 [IA] are strong .......... [oxidising / reducing] agents since they are electron ............. [acceptors/ donors].

Answer»

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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