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Atoms of eight elements A, B, C, D, E, F, G and H have the same number of electronic shells but are different in their outermost shells. It was found that elements A and G combine to form an ionic compound which can also be extracted from sea water. Oxides of the elements A and B are basic in nature while those of E and F are acidic. The oxide of elements D is almost neutral.
Q. To which period the listed elements belong?
  • a)
    2nd
  • b)
    7th
  • c)
    8th
  • d)
    3rd
Correct answer is option 'D'. Can you explain this answer?
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Read the passage and answer the question from :Atoms of eight element...
The elements belong to the third period of the periodic table, and have the same number of electron shells but different numbers of electrons in their outermost shells. The number of valence electrons in these elements increases from 1 to 8, on moving from left to right in this period.
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Read the passage and answer the question from :Atoms of eight elements A, B, C, D, E, F, G and H have the same number of electronic shells but are different in their outermost shells. It was found that elements A and G combine to form an ionic compound which can also be extracted from sea water. Oxides of the elements A and B are basic in nature while those of E and F are acidic. The oxide of elements D is almost neutral.Q. To which period the listed elements belong?a)2ndb)7thc)8thd)3rdCorrect answer is option 'D'. Can you explain this answer?
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