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An atom is mostly ____ with a tiny dense nucleus. alloy
The ____ of pure water is 7. atomic number
Copper, gold, iron, lead, mercury, and silver are ____ elements. metal
The air we breathe is about 78% ____ and 21% oxygen. mixture
An ____ is a mixture of a metal and one or more other elements. neutron
A ____ is either homogeneous or heterogeneous. nitrogen
A ____ is a subatomic particle with no electric charge. pH
An element's ____ is the number of its protons. space

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