An electron source is a bond or a lone pair of electrons. It is either a p bond or a lone pair on an atom of relatively high electron density in a molecule or ion, or a bond that must break during a reaction. An electron sink is an atom on a molecule or ion that can accept a new bond or lone pair of electrons.
What Military Threat Does North Korea Pose? It is impossible to say whether the recent threats from North Korea constitute a clear and immediate danger or whether the strong threats are just bluster in order to extract food aid and technical assistance from the international community.
Five years later, in 2016, there still is hope that the United States and its Asian allies can prevent North Korea from developing a nuclear-capable ICBM. Pyongyang, however, is not cooperating. North Korea conducted its fourth nuclear test in January, with Kim Jong Un boasting that it had exploded a hydrogen bomb.