nuclear weapon

[claymore]

Can a nuclear bomb be made out of an element heavier than hydrogen

[rojash]

what, like plutonium for example?

[Teddio]

The Hiroshima bomb was a Uranium fission device.

[Loosehead]

I would say that all the components would be heavier than Hydrogen!

[Clanad]

Actually, no element is lighter than hydrogen, as alluded to by Loosehead... at least on my Periodic Table: (http://elements.wlonk.com/ElementUses.htm)...

[fo3nix]

Two methods for nuclear weapon:

- fission
- fusion

fusion involves hydrogen, fission involves other stuff like plutonium etc.

[rojash]

Even fusion devices use heavy elements to initiate the reaction. In fact most fusion bombs are triggered by small fission bombs.

[Teddio]

Fusion bombs may use Deuterium and Tritium, both isotopes of Hydrogen.

[R1Man]

can you be more specific, you seem extraordiarily dim to me.

[jake-the-peg]

Most elements up to Iron can be made to release energy by fusing them together.

Various reactions can be seen going on in stars.

However the conditions for that fusion become more difficult, higher temperatures and temperatures.

That is why the Hydrogen isotopes are the elements of choice for fusion

[buildersmate]

There is great confusion in all of the above answers. The question said 'heavier' not 'less dense'.
Of course such a bomb can be made - it merely depends on the large mass of the hydrogen that one is comparing it to.