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Question
Which among the following alkali metal has the highest density ?
Which among the following alkali metal has the highest density ?
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Solution
The correct option is D Cs
Because of the larger size, alkali metal have low density which increases down the group from Li to Cs.
Theory
Physical properties:
All the alkali metals are silvery white, soft and light metals
Because of the larger size, these elements have low density which increases from Li to Cs. However, potassium is lighter than sodium.
The melting and boiling points are low due to weak metallic bonding (single valence electron)
Lattice energy decreases from Li to Cs and thus Melting points and Boiling points also decrease from
Li to Cs.
M.P. = Li > Na > K > Rb > Cs
B.P. = Li > Na > K > Rb > Cs
Because of the larger size, alkali metal have low density which increases down the group from Li to Cs.
Theory
Physical properties:
All the alkali metals are silvery white, soft and light metals
Because of the larger size, these elements have low density which increases from Li to Cs. However, potassium is lighter than sodium.
The melting and boiling points are low due to weak metallic bonding (single valence electron)
Lattice energy decreases from Li to Cs and thus Melting points and Boiling points also decrease from
Li to Cs.
M.P. = Li > Na > K > Rb > Cs
B.P. = Li > Na > K > Rb > Cs
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