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.
Confidence votes 77.9K. An atom becomes radioactive when it is created. It's that simple. Radioactivity is a phenomenon associated with atoms that have unstable nuclei. The key is that the protons and neutrons that form the nucleus don't like the arrangement there and the atomic nucleus is unstable.The ratio of protons to neutrons in a nucleus is intrinsically unstable.lpha decay is when an unstable, or radioactive, nucleus gives off an alpha particle, which consists of two â¦ protons and two neutrons. Beta decay is when a nucleus gives of a positron or an electron, called a beta particle, and gamma decay is when a nucleus gives off a gamma ray.