Because each chemical element has a different atomic structure and contain a different number of protons and electrons.
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Elements are different because each element has a unique number of protons in its nucleus, which determines its atomic number. This atomic number gives each element distinctive chemical properties and behaviors. Additionally, elements have different arrangements of electrons in their atomic structure, further contributing to their differences.
It is very normal that different compounds or elements have different properties. Each is a specific entity.
Grouping describes the behavior of elements. Different groups have different properties.
Isotopes are atoms of the same elements with different number of neutrons.
Radioactive
If there are 109 different elements, there must be 109 different atomic numbers since each element has a unique atomic number that distinguishes it from other elements on the periodic table.