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It reflects the repeating pattern of properties based on atomic number.
Similar valence electron counts lead to similar chemical properties.
They determine an atom's chemical behavior and properties.
They possess the same number of valence electrons.
Groups are vertical columns; periods are horizontal rows.
He predicted undiscovered elements by leaving gaps in his table.
It illustrates electrons in energy levels around a nucleus.
They have the same protons but different neutrons.
Protons equal atomic number; neutrons equal mass number minus atomic number.
Atomic number counts protons; mass number counts protons and neutrons.
It shows valence electrons as dots around the element symbol.
They are formed when elements chemically bond together.
Ionic bonds involve electron transfer; covalent bonds involve electron sharing.
They are weak attractions between molecules.
Atoms aim for eight electrons in their outer shell.
Ionic compounds have high melting points and conduct electricity in water.