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periodic classification of elements — Science STD 10 — Question

Gujarat BoardEnglish MediumSTD 10Scienceperiodic classification of elements1 Mark
Question
From the following elements: ${ }_{20} \mathrm{Ca},{ }_3 \mathrm{Li},{ }_{11} \mathrm{Na},{ }_{10} \mathrm{Ne}(\mathrm{a})$ Select the element which has two shells, both of which are completely filled with electrons. (b) Select two elements of the same group.
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Answer

  • (a) Element in which two shells are completely filled with electrons is $_{10}Ne (2, 8).$
  • (b) Two elements of the same group are ${ }_3 \mathrm{Li}(2,1)$ and ${ }_{11} \mathrm{Na}(2,8,1)$.

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