IONS. Neutral Atoms: Review Neutral Atoms have the same number of PROTONS and ELECTRONS. Protons have a POSITIVE charge. + Electrons have a NEGATIVE charge.

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Presentation transcript:

IONS

Neutral Atoms: Review Neutral Atoms have the same number of PROTONS and ELECTRONS. Protons have a POSITIVE charge. + Electrons have a NEGATIVE charge. -

What is an ION? IONS- Atoms that have LOST or GAINED electrons.

ANION: A negative ion. Name now ends in IDE.

CATION: A POSITIVE ion. Name remains the same.

Why do atoms gain or lose electrons? To have a FULL outer shell. When atoms have a full (8 electrons) outer shell, the atom has a STABLE electron configuration.

GAIN OR LOSE? If an atom has 5, 6, or 7 electrons it will GAIN (steel) electrons in order to have 8 electrons in its outer shell (ring).

When an atom gains electrons it now has more “-” or negative charges and it becomes NEGATIVE.

GAIN OR LOSE? If an atom has 1, 2 or 3 electrons it will LOSE (give) electrons in order to have 8 electrons in its “new” outer shell.

When an atom loses electrons it now has more “+” or positive charges, so it becomes POSITIVE.