The structure of Atom I
Matter
Matter
Matter is anything that occupies space and has mass.
The particle theory of matter
The particle theory of matter states that matter is made up of a large number of tiny and
discrete particles.
Atom, Molecule and Ion
The particles can be atoms, molecules or ions
Atom
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Molecule
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Ion
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The atom is the smallest,
indivisible particle of an
element. Atoms of the same
element are exactly alike and
are different from the atoms of
all other elements.
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Molecules are the smallest
particles of an element or
compound that are made up of
two or more atoms.
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Ions are particles that are
charged due to loss or gain of
electrons.
Ions which are positively
charged are called cations.
Ions which are negatively
charged are called anions.
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Example:
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Example:
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Element and Compound
1. Matter can either exist as an element or a compound.
Element
1. Chemical element is the class of atoms with the same number of protons in the
nucleus.
2. An element consists of only one type of atom.
3. Element can be either atoms or molecules.
Compound
1. A compound is any substance composed of identical molecules consisting of
atoms of two or more elements.
2. A compound is made up of either molecules or ions.
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