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Why are sodium (Na) and potassium (K) pl...

Why are sodium (Na) and potassium (K) placed in the same group of the pariodic table? Give any two reaons?

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The reaons behind placing Na and K in the same group of the periodic table are (i) the valence shell electronic configuration of Na and K are same.
Na: `1s^(2)2s^(2)2p^(6)3s^(1)" "K:1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)4s^(1)`
(ii) Both Na and K are univalent elements and form stable ionic compounds like NaCl, KCl etc.
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