A positively charged nuclear particle
that has two protons?
The best answer here should be an alpha
particle. A α-particle consists of two
protons and two neutrons, which is a helium nuclei and not atom because of the
positive charge and we are talking of nuclear particles here.
An alpha particle has two protons, this automatically
gives it the two nuclear charge and two neutrons this gives it the mass of
approximately 4 amu.
It is called a nuclear particle because it
emitted as a result of a radioactive nuclear decay. When an atom emit an alpha
particle it lost two from it atomic number and four from it mass number,
therefore it drop two positions on the periodic table of element.
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