Valence electrons, located in the outermost shell of an atom, play an important role in driving chemical reactions and forming bonds with other atoms.

Photoshop CS6 tutorial showing how to make a scary-looking X-ray of a face from an ordinary headshot. Skull image: <a href=" ...

In this paper, we model the optical extinction and X-ray scattering properties of intergalactic dust grains to constrain the intergalactic opacity using a combined analysis of observed quasar colours ...

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