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Science · 2022 · 2 marks
CBSE 2022 · Region 2 · Set 1 · Q2
The atomic number of an element 'X' is 11. (i) Write the electronic configurations of X and find its valency. (ii) Write the formula and nature of…
The atomic number of an element 'X' is 11.
(i)
Write the electronic configurations of X and find its valency.
(ii)
Write the formula and nature of its oxide.
Marking-scheme solution
(i) • Electronic configuration of X is $\displaystyle 2$, $\displaystyle 8$, $\displaystyle 1$
Valency is \(\displaystyle 1 /+1\)
(ii) • \(\displaystyle \mathrm{X}_{2} \mathrm{O} / \mathrm{Na}_{2} \mathrm{O}\)
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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.