Question

How are elements formed?

Answer 1

Elements are formed by the gravitational forces in stars causing the fusion of lighter elements into the heavier ones.

Explanation:

Hydrogen and helium were also formed during the particle condensation after the "Big Bang" in that theory of universe origin.

We can fuse limited elements in laboratory experiments (and fusion nuclear bombs!), but it is energetically very unfavorable, so we must use the elements found in nature.

See also:
http://science.jrank.org/pages/2412/Elements-Formation-Formation-elements.html