3) Ion: Any atom with an electrical charge (+ or -), not neutral
Since an atom has the same number of protons and electrons is said to be electrically neutral. When an atom or element gains or loses one or more electrons, making the number of protons and electrons unequal, it is called an ion .
Gaining electrons = Negative charge (-)
Loosing electrons = Positive charge (+)
Therefore:
Cation: a (+) charged atom Ex:
Anion: a (–) charged atom Ex:
Atoms interact with each other in order to gain stability. Two or more atoms can combine to form compounds and molecules.
4) Compound :
A compound is any two or more different elements that bind together or a chemical substance that can be broken down into two or more different elements by chemical means. A compound always contains atoms from two or more different elements.
Example:
5) Molecule : when any two or more atoms combine by sharing electrons.
Example:
**A ll compounds are molecules, but not all molecules are compounds **
WHY?
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