Quite low density: 0.968 g·cm−3
The 1st group elements i.e. Lithium,Sodium, Potassium, Rubidium, Cesium and Francium are all low density metals and they react violently with water.
Is it to do with the atomic number of a particular element or the volume of the element.
You think probable to beryllium.
Phosphorus has a low density, around 1.82 g/cm3 for white phosphorus and 2.34 g/cm3 for red phosphorus.
Lithium. Lithium has low density and is 3rd element in periodic table with mass of 6.941 g/mol. Lithium is used in different types of batteries, such as lithium-ion(Lion), Lithium-polymer(LiPo). Both are rechargeable.
It varies. Many metal have high density. In fact, the metals iridium and osmium are the densest substances known to man. However some metals are light. Lithium and sodium are even less dense than water.
Charcoal has a low density because it is porous and lightweight.
Lithium
high
Low sodium diets can be confusing. A low sodium diet means eating more foods that have low sodium contents instead of high ones. The nutriesystem diet is a low sodium diet.
One example of a soft element with low density is potassium. It is a soft, silvery-white metal that can be easily cut with a knife and has a low density compared to many other metals.
low