Examlex
Silicon has five valence electrons.
Background Radiation
The ubiquitous ionizing radiation present in the environment, originating from natural and artificial sources like cosmic rays, radon gas, and medical x-rays.
Consumer Products
Goods that are produced and sold for personal use or consumption, ranging from food and clothing to electronics and household items.
Terrestrial Radiation
The naturally occurring radiation from radioactive materials in the soil, rocks, and atmosphere.
Earth's Crust
Earth's crust is the outermost layer of the Earth, consisting of rocks and minerals, and constituting less than 1% of Earth's volume.
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