Most elements can be found in nature up to around Atomic Number 83. With some exceptions such as Technitium and Promethium. Above Atomic Number 83 elements become very unstable as their Nuclei are so large they quickly break down, very often through radioactive decay.
One of the best-known examples is Neptunium and Plutonium. Through discoveries of the radioactive element Uranium, scientists at the University of Berkeley in the 1940’s experimented with bombarding Uranium with neutrons. Through the process of beta decay (where a neutron converts into a proton) scientists discovered the elements Neptunium and Plutonium, two previously unknown elements created from experiments in the lab.
Elements are atoms with the same number of protons in the nucleus
A proton is a positive particle that makes up the atom in the nucleus with a positive charge
A neutron is a neutral sub atomic particle that makes up the nucleus with the proton
The electron is the smallest sub atomic particle that make up the atom. Has a negative charge and is located in shells that orbit the nucleus
A beta particle occurs when a neutron in an unstable nucleus turns into a proton and electron. The electron is released from the atom as the radiation