Atoms will gain, lose, or share electrons to match the number of outer shell electrons of a noble gas.
Elements acquire a stable atomic structure like that of a noble gas by gaining, losing, or sharing electrons to achieve a full outer electron shell. This full outer shell results in a stable electron configuration similar to that of noble gases, which have complete valence electron shells. This stability is achieved by attaining a full outer electron shell and minimizing electron repulsion.
Ions are formed when elements gain or lose electrons.
There are three different ways for this. Elements can either gain electrons or lose electrons or share electrons and attain a stable noble gas electronic configuration.
All isotopes of all elements with atomic number similar or greater than 84 are radioactive, and don't have stable nuclei.
Only up through bismuth.
The hydrogen-1 isotope is the only known radioactively stable isotope with no neutrons.
All elements above the atomic number of 83 are radioactive, but two elements that are under it are also radioactive. They are technetium (atomic number 43) and promethium (atomic number 61). Radioactive elements are elements that decay until stable. =)
Group 8 elements, also known as the Noble Gases, have a full valence shell of electrons making them chemically stable and unreactive. They are colorless, odorless, and tasteless gases at room temperature. They have low boiling points and do not readily form compounds with other elements.
Many of the elements with higher atomic numbers have no stable form yet discovered, ex: ununoctium.
Mono isotopic elements are stable isotope of an element.From 80 isotopic elements there are 26 radioactive elements discovered up till now.These mono isotopic may or may not be radioactive if they are radioactive they have halve lives.
The elements with the smallest atomic radii are found in the top of the P block of the periodic table. Helium (He) has the smallest atomic radius. Francium, on the other side of the periodic table (very bottom of the S block), has the largest atomic radius.
A stable element is any non-radioactive element. All elements before element atomic number 84 (not including 84) - Polonium (Po) are stable elements.