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Name any two elements of group one and w...

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 above said element.

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(i) Two elements of group 1 are Na, K / Sodium, potassium.
Electronic configurations Na = 2,8,1, K = 2,8,8,1
(ii) Similarity : Both have one valence electron / One electron in outermost shell.
Oxide : `Na_(2)O //K_(2)O`.
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