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Periodic Classification of Elements — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10SciencePeriodic Classification of Elements3 Marks
Question
Name any two elements of group one and write their electronic configurations. What similarity do you observe in their electronic configurations? Write the formula of oxide of any of the aforesaid element.
✓

Answer

Two elements that belong to group 1 are lithium and sodium. The electronic configurations of these elements and the formulae of their oxides are mentioned in the table given below.
Element
Symbol
Electronic Configuration
Formula of Oxide
Lithium
Li
2, 1
 $Li_2 O$
Sodium
Na
2, 8, 1
 $Na_2 O$

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