The periodic table is an arrangement of elements in order of increasing atomic numbers.
In the periodic table, the most abundant group of elements are the metals. They compose more than three quarters of the periodic table. The groups of nonmetals are quite few.
The vertical columns in the periodic table are called groups. Elements in the same group have similar chemical properties because they have the same number of valence electrons.
In the periodic table, there are about 110 elements in the periodic table. The rows in the periodic table are called periods and elements in the same period do not have similar properties. However, elements in the same column or group have the similar properties.
The particles in the outer shell of an atom are called valence electrons. They are the electrons that take part in a chemical reaction.
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