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Science · 2022 · 2 marks
CBSE 2022 · Region 1 · Set 1 · Q2
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.…
The electrons in the atoms of two elements X and Y are distributed in three shells having $\displaystyle 1$ and $\displaystyle 7$ 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 ?
Marking-scheme solution
(a) X Y
Group Number $\displaystyle 117$
(b) XY
(c) X
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CBSE Class 10 Science past-paper question from the 2022 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.