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Science · 2022 · 2 marks
CBSE 2022 · Region 2 · Set 3 · Q1
(i) Write the electronic configuration of element X, given by its symbol as under: _20^40 X. (ii) Determine its position in the modern periodic…
(i)
Write the electronic configuration of element X , given by its symbol as under : \[{ }_{20}^{40} \mathrm{X} . \]
(ii)
Determine its position in the modern periodic table.
(iii)
What is the nature of its oxide ?
(iv)
Name one other element of its group.
Marking-scheme solution
(i) \(\displaystyle \mathrm{X}-2,8,8,2\)
(ii) Group - $\displaystyle 2$; Period - $\displaystyle 4$
(iii) Basic
(iv) Beryllium/Magnesium/Strontium/Barium
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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.