In this case the atomic number decrease by 2.
It happens when a beta particle is emitted from the nucleus of the atom of element 92. Beta Particle is emitted when a neutron is converted to a proton.So atomic number that is , the no of protons increases by 1. Hence 92 becomes 93.
Alpha emission in an atom reduces its atomic number by two. A link can be found below to the related question about what alpha decay is.
atomic radius decreases from bottom to top of the periodic table.
Four
Polonium, which has an atomic number of 84, decays to astatine, which has an atomic number of 85, a negative beta particle is emitted.
With the ejection of a beta particle (electron), there is a minute loss of mass. Electrons have very low mass. The atomic number increases though as a neutron is transformed into a proton. A antineutrino is also ejected. In a similar process, positron emission also called beta decay,- a positron is emitted and a proton is transformed into a neutron, the atomic number decreases. A neutrino is also ejected.
It happens when a beta particle is emitted from the nucleus of the atom of element 92. Beta Particle is emitted when a neutron is converted to a proton.So atomic number that is , the no of protons increases by 1. Hence 92 becomes 93.
The atomic radius decreases from left to right and increases from top to bottom
An Alpha particle
Alpha emission in an atom reduces its atomic number by two. A link can be found below to the related question about what alpha decay is.
It's been awhile for me, but this is how I remember it. It is not convenient for me to look it up right at the moment, so you may want to verify this. Emitting an alpha particle (2 proton 2 neutron), atomic number would decrease by 2 and atomic mass decreases by 4.Electron emission means a neutron turns into a proton and electron, but the electron shoots out. The atomic number increases by 1 and atomic mass stays the same. Proton emission, well it loses a proton. So the atomic number decreases and mass decreases.
In short, alpha radiation occurs when an unstable nucleus emits 2 protons and 2 neutrons from it's nucleus. This means that the atomic number decreases by 2 and the nucleon number decreases by 4.
atomic radius decreases from bottom to top of the periodic table.
Polonium, which has an atomic number of 84, decays to astatine, which has an atomic number of 85, a negative beta particle is emitted.
Four
The atomic radius decreases as the atomic number increases due to the fact that there is now a greater quantity of protons in the nucleus emitting greater intramolecular force, pulling the electrons closer towards it. This, thus, decreases the radius.
The atomic number increases but the atomic mass stays the same after the emission of a beta particle by a radioactive atom.