20, 25, 28, 30
bottom is the heaviest
yes
Uub and Uuq are listed on most periodic tables as the heaviest elements. (You can check the number at the bottom of the box, that is its atomic mass or weight
At the bottom of the step pyramid In the middle of a bent pyramid
Gold is heaviest so it sinks to the bottom of the pan
Displaction
Gravity !... Gravity draws everything towards the centre of the Earth - therefore the heaviest materials are closer to the core.
they deposit their load because otherwise it gets too heavy
If you are referring to the 6 stack in which there are 3 cups on the bottom, 2 in the middle, and 1 on top, then there is no offical wssa (world sport stacking association) record for that as it is not an offical event. The offical events are 3-3-3, 3-6-3, cycle, doubles, and team. The current records can be found at worldsportstackingassociation.org
· dinghy
No. In fact radium is at the bottom of the periodic table where the heaviest elements are. Its atomic number is 88 (compare with carbon, the standard element; atomic number 6)
If you're weighing it at sea level, then it weighs roughly 14.6 pounds for every square inch of area that the bottom of the column rests on.