Check properties of atoms and the periodic table section 2. 3A physical property is a characteristic of matter that is not associated with a change in its chemical composition. 101 Each element is composed of extremely small particles called atoms. The Periodic Table Elements in each group have similar properties. Read also atoms and properties of atoms and the periodic table section 2 Familiar examples of physical properties include density color hardness melting and boiling points and electrical conductivity.
A modern periodic table arranges the elements in increasing order of their atomic numbers and groups atoms with similar properties in the same vertical column Figure 2. The properties of the elements are periodic functions of their atomic numbers.
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The atomic mass identified on the Periodic Table is the average atomic mass of all the isotopes that exist for that element.

The elements in group 1 except for hydrogen are known as alkali metals and the elements in group 2 as alkaline earth metals. Atomic number the number of protons in an atom. Atomic and ionic radii. Some physical properties such as density and color may be observed without changing the physical. Structure of the atom Section 2. 3 Atoms of different elements have different properties including mass and chemical reactivity.
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