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(i) Atomic number of Mg and Al are 12 an...

(i) Atomic number of Mg and Al are 12 and 13, respectively. Write down their electronic configuration.
(ii) Mention the period of the modern periodic table to which the above two elements belong. Give reason for your answer.

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(i) Mg : 2, 8, 2, Al: 2, 8, 3
(ii) `3^(rd)` period because electrons in these atoms are filled in K, L, M shells.
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OSWAAL PUBLICATION-PERIODIC CLASSIFICATION OF ELEMENTS-TOPIC:2-SHORT ANSWER TYPE QUESTIONS-I
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  5. The atomic radii of three elements A, B and C of a periodic table are ...

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  6. (i) Atomic number of Mg and Al are 12 and 13, respectively. Write down...

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  7. Arrange the following elements in the descending order of atomic size ...

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  10. Nitrogen (atomic number 7) and phosphorous (atomic number 15) belong t...

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  14. Given below are atomic radii of same elements of second period. {:("...

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  16. Two elements X and Y have atomic numbers 12 and 16 respectively. To wh...

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  17. The atomic number of elements A, B, C, D and E are given below: F...

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