The top three U.S. exports to China in 2008 were electrical machinery ($9.5 billion), oil seeds and related products ($9.3 billion), and nuclear reactors and related machinery ($8.4 billion). China is now one of the most important markets for U.S. exports: in 2009, U.S. exports to China totaled $69.6 billion, a 0.2% decrease from 2008. Those percentages were down far less than U.S. exports to other major trading partners in the year following the global financial crisis.
Return to questions. 1) A positively charged particle made up of two protons and two neutrons and released by a radioactive nucleus is the alpha particle. 2) An electron released by a radioactive nucleus that causes a neutron to change into a proton is called a beta particle.3) The amount of time for half the atoms in a radioactive sample to decay is called the half-life.eturn to questions. 1) A positively charged particle made up of two protons and two neutrons and released by a radioactive nucleus is the alpha particle. 2) An electron released by a radioactive nucleus that causes a neutron to change into a proton is called a beta particle.
Report Abuse. Because they're unstable. The nuclei of radioactive isotopes have more neutrons than protons (a stable element would have equal numbers of each) and thus emit neutrons as a way of balancing things out. This process is called decay.The time it takes for half a given amount to decay into a more stable form is called the half-life.eport Abuse. Because they're unstable. The nuclei of radioactive isotopes have more neutrons than protons (a stable element would have equal numbers of each) and thus emit neutrons as a way of balancing things out. This process is called decay.