Science
The electrons in the atoms of two elements X and Y are distributed in three shells having 1 and 7 electrons respectively in their outermost shells.
(a) Write the group numbers of these elements in the Modern Periodic Table.
(b) Write the molecular formula of the compound formed when X and Y combine with each other.
(c) Which of the two is electropositive ?
Periodic Table
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Answer
(a) As the number of electrons present in the outermost shell determines the group number of any element, hence, element X belongs to group 1 (as it has one electron in the outermost shell), and element Y belongs to group 17 (as it has seven electrons in the outermost shell.)
(b) Molecular formula of the compound formed between X and Y is XY.
Reason — As element Y has 7 electrons in its outermost shell, it only needs 1 electron to complete its octet and element X has 1 electron in its outer shell, it will try to donate it and attain a stable octet (because it has 8 electrons in 2nd shell). As a result, element Y will take one of the electrons released by element X and both will attain a stable configuration. Hence, the resulting molecule will have the molecular formula XY.
(c) As X donates its electrons hence, it is said to be electropositive.
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