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Four elements P, Q, R and S belong to th...

Four elements P, Q, R and S belong to the third period of the Modern Periodic Table and have respectively 1,3,5 and 7 electrons in their outermost shells. Write the electronic configurations of Q and R and determine their valencies. Write the molecular formula of the compound formed when P and S combine.

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Electronic configuration of Q = 2, 8,3
Valency of Q = 3
Electronic Configuration of R = 2,8, 5
Valency of R = 8-5 = 3
Electronic configuration of P = 2,8,1
Electronic configuration of S = 2, 8, 7
Formula : PS/Nacl
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OSWAAL PUBLICATION-PERIODIC CLASSIFICATION OF ELEMENTS-TOPIC:2- SHORT ANSWER TYPE QUESTIONS-II
  1. Two elements 'P' and 'Q' belong to the same period of the modern perio...

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

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

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

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

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

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

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  8. Study the following table in which positions of six elements A, B, C, ...

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  9. The elements Li, Na and K, each having one valence electron, are in pe...

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  10. An atom has electronic configuration 2, 8, 2. (i) What is the atomic...

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  11. Two elements X and Y belong to group 1 and 2 respectively in the same ...

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  12. Four elements A, B, C and D along with their electronic configuration ...

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

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  14. Three elements X, Y and Z have atomic numbers 7, 10 and 14 respectivel...

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  15. From the following part of the periodic table, answer the following qu...

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  16. The position of three elements A, B and C in the periodic table are sh...

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  17. Given below are some elements of the Modern Periodic Table: ""(4)Be,...

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  18. Write the number of period the modern periodic table has. How do the v...

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  19. An element X (atomic number 17) reacts with an element Y (atomic numbe...

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  20. Using the given part of the periodic table, answer the following quest...

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