In heavy atoms it spreads swiftly and is hard to stop.

All reactors rely on a chain reaction in which heavy atoms are split to release bursts of energy and heat.

They can later join to form heavier atoms.

This is best suited to samples containing heavy atoms, as they cause more scattering of electrons.

The most complex of them have four "heavy" (carbon and/or nitrogen) atoms.

The other is the Patterson method, which directly determines the positions of heavy atoms.

And they do occasionally send them smashing into fixed targets which are made up of heavier atoms.

Fewer heavy atoms were available at the time it formed with its planets.

The technique is most effective when the crystal contains both lighter and heavier atoms.

For example, many people question the expensive and time consuming experiments aimed at synthesizing ever heavier atoms.