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An element 'X' (Atomic number = 20) burn...

An element 'X' (Atomic number = 20) burns in the presence of oxygen to form a basic oxide.
(i) Identify the element and write its electronic configuration.
(ii) State its group number and period number in the Modern Periodic Table.
(iii) Write a balanced chemical equation for the reaction when this oxide is dissolved in water.

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(i) X(20) --- 2, 8, 8, 2. It is calcium.
(ii) Second group, fourth period.
(iii) `CaO+H_(2)OtoCa(OH)_(2)`
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OSWAAL PUBLICATION-PERIODIC CLASSIFICATION OF ELEMENTS-TOPIC:2- SHORT ANSWER TYPE QUESTIONS-II
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  2. Two elements P and Q belong to the 3rd period of the Modern Periodic T...

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  3. An element 'X' (Atomic number = 20) burns in the presence of oxygen to...

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  4. An element 'X' belongs to third period and second group of the Modern ...

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  5. The atomic number of an element 'X' is 19. (i) Write its electronic ...

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  6. An element 'X' belongs to the 3rd period and group 16 of the Modern Pe...

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  7. An element X has mass number 35 and number of neutrons = 18. Write ato...

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  8. Three elements 'X', 'Y' and 'Z' have atomic numbers 7, 8 and 9 respect...

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  9. The position of eight elements in the modern periodic table is given b...

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  10. Four elements A, B, C and D have atomic numbers 12, 13, 14 and 15 resp...

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  11. From the following elements : (4)Be,(9)F,(19)K,(20)Ca (i) Select t...

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  12. Na, Mg and Al are the elements of the same period of modern periodic t...

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  13. The elements (4)Be,(12)Mgand(20)Ca each having two, valence electrons ...

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  14. Two elements 'P' and 'Q' belong to the same period of the modern perio...

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  15. The atomic number of an element 'X' is 20. (i) Determine the positio...

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  16. Four elements P, Q, R and S belong to the third period of the Modern P...

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  17. In the following table, the positions of six elements A, B, C, D, E an...

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  18. The electrons in the atoms of four elements A, B, C and D are distribu...

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  19. Based on the group valency of elements state the formula for the follo...

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  20. Consider two elements ‘A’ (Atomic number 17) and 'B' (Atomic number 19...

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