The heaviest baboon is the male chacma baboon, which can weigh between 40 to 100 pounds (18 to 45 kilograms). Males typically weigh more than females, and their size can vary based on habitat and availability of resources. In some cases, exceptionally large individuals may exceed these weight ranges, but such instances are rare.
Helium.
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.
The nucleus of an atom is the heaviest part and contains most of the atom's mass. It is made up of protons and neutrons. Electrons, which orbit the nucleus, have much less mass compared to protons and neutrons.
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.
Jupiter is the biggest and heaviest planet.
Jupiter, with a mass 318 times that of the Earth.
In the atom the heaviest particle is the neutron but the proton is close.
Francium is the heaviest of the alkali metals, with an atomic mass of 223 grams.
Nitrogen is heavier than hydrogen but lighter than oxygen. In terms of molecular weight, nitrogen has a molar mass of about 28 g/mol, oxygen has a molar mass of about 32 g/mol, and hydrogen has a molar mass of about 2 g/mol.
Jupiter is twice the mass of all the other planets combined. It is more useful and more accurate to refer to the mass of planets, and not to their weight.