Ions are electrically charged particles formed when atoms lose or gain electrons. They have the same electronic structures as noble gases. Metal atoms form positive ions, while non-metal atoms form negative ions. The strong electrostaticforces of attraction between oppositely charged ions are called ionic bonds.
Metal atoms lose the electron, or electrons, in their highest energy level and become positively charged ions. Non-metal atoms gain an electron, or electrons, from another atom to become negatively charged ions
The number of charges on an ion formed by a metal is equal to the group number of the metal; aluminium would be 3+, and magnesium would be 2+.
The number of charges on an ion formed by a non-metal is equal to the group number minus eight; nitrogen would be 3-, and flourine would be 1-.
Hydrogen forms H+ ions, despite it being a non metal.
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