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Out of electrons, protons, and neutrons, neutrons are the heaviest subatomic particle, with a mass of about 1838 times that of the electron. (If you are asking about electrons, up quarks, and down quarks, then electrons still aren't the heaviest Down quarks are the heaviest, with almost 10 times the mass of an electron.)
Francium is the heaviest of the alkali metals, with an atomic mass of 223 grams.
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
The largest subatomic particle (by mass) is the proton. The mass of subatomic particles is measured in atomic mass units (amu). The proton has a mass of 1.007 amu, the neutron has a mass of 1 amu, and the electron has a mass of .0005 amu.
The most mass of a atom is located in the nucleus, where the protons and the neutrons are located.
The mass of a stone in water is the mass of the stone outside water. The mass of an object is always its mass. (This assumes we are not discussing the theory of relativity.) On Earth, or the Moon or in water or not, mass is mass. What might be relevant, however, is the weight of a stone in water compared to the weight of a stone outside the water. Weight and mass are different. If you hold a stone in water and hold the same stone in air, you can feel a difference in the force you must apply to support the stone. In water, the stone feels a buoyant force equal the the weight of the water displaced. That is Archimedes principle. There is a difference in the apparent weight of a stone in water and a stone out of water equal to the eight of the water displaced.
Helium.
Isotopic mas of hydrogen ia '1' Isotopic mass of nitrogen is '14' Isotopic mass of oxygen is '16' It follows that oxygen is the n=heaviest of these gases.
jupiter
Nucleus
The heaviest term for mass that I've ever came across is a Solar Mass. As in the star Beta Pictorus is said to be 1.5 solar masses.
I think the "Top" quark is probably the heaviest, which has a mass about that of 170 hydrogen atoms.
Out of electrons, protons, and neutrons, neutrons are the heaviest subatomic particle, with a mass of about 1838 times that of the electron. (If you are asking about electrons, up quarks, and down quarks, then electrons still aren't the heaviest Down quarks are the heaviest, with almost 10 times the mass of an electron.)
Ununseptium and Ununoctium are currently tied.
The blue whale is the world's largest and heaviest living mammal. The largest "land" mammals are elephants and hippos, with African elephants being the heaviest. (Like whales, hippos use the buoyancy of water to offset their great mass, and can move easily in rivers and ponds.)
It is more dense than water, and [presumably] it is not shaped in such a way that all of its weight can be displaced before the stone submerges.
Jupiter, with a mass 318 times that of the Earth.