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Solution - Position of Elements and Trends in the Modern Periodic Table

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Question

Elements in the same group show the same valency. Give scientific reason.

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The electrons in the atoms of four elements A, B, C and D are distributed in three shells having 1, 3, 5 and 7 electrons in the outermost shell respectively. State the period in which these elements can be placed in  the modern periodic table. Write the electronic configuration of the atoms of A and D and the molecular formula of the compound formed when A and D combine.

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Solution for concept: Position of Elements and Trends in the Modern Periodic Table. For the course 9th - 10th SSC (English Medium)
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