Very few - if any - things are made of bismuth. They are usually made from bismuth compounds. And, bismuth compound usually behave very differently to bismuth just as water is very different from hydrogen!
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No. Mass is what things are made of. Area is a way to how much length and width is covered by one of an objects sides.
There should be 128 objects.
There are 2^35 = 34,359,738,368 possible groups: 1 group with none of the objects in it; 35 groups with 1 object in them; 595 groups with 2 objects in them; 6,545 groups with 3 objects in them; ... 6,545 groups with 32 objects in them; 595 groups with 33 objects in them; 35 groups with 34 objects in them; 1 group with all 35 objects in it.
Objects that are not flat are any 3-Dimensional objects. A 3-Dimensional object has volume, where as a 2-Dimensional object does not. Examples of 3-Dimensional objects are sphere, cube, and cylinder.
Such objects are said to be congruent.