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Inorganic Chemistry

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13 Jan 2007 23:26:41 IST

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s-block elements

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why is potassium less dense than sodium?

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rashmi

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14 Jan 2007 13:36:54 IST

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its atm size is greater than Na.

ashish ranjan

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14 Jan 2007 14:20:40 IST

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size of K is larger in comparision 2 Na, increase in radius of potassium overshadows the increasing in its mass. consequently, potassium is lighter than Na.

smriti.mathur

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15 Jan 2007 13:13:11 IST

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The mass/volume ratio, ie., density increases in a group. However, the atomic volume of Potassium is more as compared to Sodium, that's why its density is less than Sodium.

arun-rashi

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17 Jan 2007 08:52:08 IST

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density increases down the group but there is exception in Na ,k and Ca and Mg.in case of k electron filling takes place in 4s without filling 3d so volume increases so much and density decreases same with Ca and Mg.in alkaline earth metals many exception so read carefully.

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