Examlex
An atomic nucleus consists of protons and neutrons and is positively charged.
Quartz
A hard, crystalline mineral composed of silicon dioxide, notable for its durability and its use in making jewelry and electronic equipment.
Oxides
Compounds composed of oxygen and another element, which can form minerals and play significant roles in geological processes.
Hematite
Hematite is an iron oxide mineral and one of the main iron ores, characterized by its reddish-black color, metallic or earthy luster, and used as an important source of iron.
Element O
Element O refers to Oxygen, a chemical element with the symbol O and atomic number 8, essential for life and a major part of the Earth's atmosphere.
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