Atoms whose outer shell is filled have eight valence electrons and belong to Group XVIII. This group is known as the noble gases.
An ion is an atom with a net electric charge. An ion is formed when an atom either gains or loses a valence electron. Atoms with an unfilled outer shell tend to gain or lose electrons so they can achieve a filled outer shell. Atoms that gain an electron are negative ions, and atoms that lose an electron are positive ions.
A completley filled out electron level makes the atom stable
No. The inner shells are filled first.
These are the valence electrons.
The noble gasses all have a filled outer electron shell of eight electrons, except helium which has two electrons. Since their outer electron shells are filled, they are less likely to react with other atoms.
stable and chemically nonreactive, or inert.
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An ion is an atom with a net electric charge. An ion is formed when an atom either gains or loses a valence electron. Atoms with an unfilled outer shell tend to gain or lose electrons so they can achieve a filled outer shell. Atoms that gain an electron are negative ions, and atoms that lose an electron are positive ions.
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Atoms do not always lose electrons. Electrons can be gained too. Atoms always try to have their outer most shell filled, and some atoms such as ones of potassium can easily lose an electron rather than gain an electron. So it would lose an electron to a different atom so that it would have a full outer shell and the other atom would also have a full outer shell.
When a compound is formed from two or more atoms of different elements, the chemical bonds that form cause the atoms in the compound to have filled valence shells.
A completley filled out electron level makes the atom stable
Atoms with full outer electron shells are more stable. The atoms (elements) with full outer electron shells are the noble (sometimes called inert) gases. These are the elements in Group 18 of the periodic table, and you know them as helium, neon, argon, krypton, exnon and radon.
Because it's in a stable state. Atoms with an electron 'missing' from their outer shell will always try to 'grab' one back to stabilize themselves. This is often done by combining with other atoms and 'sharing' an electron in order to reach stability.
electron cloud
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