There are many elements that are heavier than iron, including lead, gold, platinum, osmium, uranium, etc. Look at the periodic table of the elements.
The wooden stool is heavier than the iron nail
The nuclei of heavier atoms simply have more neutrons and protons than do lighter atoms.
Aluminum has about 1/3 the density of iron, therefore a given volume of aluminum would weigh about 1/3 as much as the same amount of iron. So no, aluminum is not heavier than iron; far from it.
Cobalt is harder than iron yet melts at a lower temperature and is somewhat heavier.
some atoms are heavier than others as they have higher relative Atomic Mass, by which is equals to proton number + number of neutrons in an atom, according to the Periodic Table of the elements
yes.
Such energy is called nuclear energy. There are basically two different variations on this principle. One, light atoms can be combined into heavier atoms (up to a certain point - somewhere around iron). This is known as fusion. The other is that heavy atoms (heavier than iron) can split into lighter atoms.
No, atomically Iron is a heavier element
Lead is heavier than iron.
No. 100 lead atoms are several times heavier than 100 aluminum atoms.
Iron is heavier because iron is a metal and metals are heavier but silica is not a metal so silica is lighter than iron.
The wooden stool is heavier than the iron nail
Yes iron is very much heavier then plastic.
Elements heavier than iron are formed in super-nova explosions.
No. Neon is lighter than iron
Gold has many more protons and neutrons in the nucleus of each atom than iron does. So each gold atom weighs almost four times as much as each iron atom. The extra electrons in the gold atoms do make the atom a little bigger than an iron atom, but not a whole lot. So there are nearly as many gold atoms as iron atoms per volume, but each gold atom weighs a lot more. So gold ends up denser.
There are probably various ways to classify it. Here is one. You can gain energy either by combining atoms that are lighter than iron or nickel into heavier atoms (a process known as fusion), or by splitting heavier atoms into lighter ones (a process known as fission).