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Science · 2022 · 2 marks
CBSE 2022 · Region 3 · Set 2 · Q4
Write the electronic configuration of an element X having atomic number 24. Explain how on the basis of this electronic configuration we can determine the valency, group number and the period number of X.
Marking-scheme solution
Electronic configuration of X : $\displaystyle 2$, $\displaystyle 8$, $\displaystyle 8$, $\displaystyle 6$
Valency = $\displaystyle 2$
Group of \(\displaystyle \mathrm{X}=6\)
Period of X=$\displaystyle 4$
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CBSE Class 10 Science past-paper question from the 2022board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.