Question

B) Find the odd one out :
1) Lithium (Li), Barium (Ba), Potassium (K) , Sodium (Na)
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Answer 1

Answer:

??????????????????potassium

Answer 2

The odd one out is Barium(Ba).

• Lithium (Li), Potassium (K) and Sodium (Na)​ belong to the Group 1A (or IA) of the periodic table and are the alkali metals while Barium (Ba) belongs to Group 2A (or IIA) of the periodic table and is an alkaline earth metal.
• In Group 1A hydrogen (H), lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr) are present. These are (except for hydrogen) shiny, soft, highly reactive, low melting metals, which tarnish when exposed to air.
• In Group 2A  beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra) are present. These are harder and less reactive as compared to the alkali metals of Group 1A.

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