On the periodic table, why is osmium most dense?

After all, each atom weighs more. But, density is mass per unit volume. Osmium (and iridium) have a very small atomic radius, so the mass is packed into a small volume

answer

fusion: the energy source of stars. the energy released from the collapse of the gas into a protostar causes the center of the protostar to become extremely hot. when the core is hot enough, nuclear fusion commences. fusion is the process where two hydrogen atoms combine to form a helium atom, releasing energy.

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