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Window valance. A window valance (or pelmet in the UK) [1] is a form of window treatment that covers the uppermost part of the window and can be hung alone or paired with other window blinds, or curtains. Valances are a popular decorative choice in concealing drapery hardware. Window valances were popular in Victorian interior design.
In chemistry and physics, valence electrons are electrons in the outermost shell of an atom, and that can participate in the formation of a chemical bond if the outermost shell is not closed. In a single covalent bond, a shared pair forms with both atoms in the bond each contributing one valence electron. The presence of valence electrons can ...
In chemistry, periodic trends are specific patterns that are present in the periodic table that illustrate different aspects of certain elements when grouped by period and/or group. They were discovered by the Russian chemist Dmitri Mendeleev in 1863. Major periodic trends include atomic radius, ionization energy, electron affinity ...
Tracery is an architectural device by which windows (or screens, panels, and vaults) are divided into sections of various proportions by stone bars or ribs of moulding. [1] Most commonly, it refers to the stonework elements that support the glass in a window. The purpose of the device is practical as well as decorative, because the increasingly ...
Some embroidery was imported in this period, including the canvas work bed valances once thought to be English but now attributed to France, but the majority of work was made in England—and increasingly, by skilled amateurs, mostly women, working domestically, to designs by professional men and women, and later to published pattern books. [24]
Double-slit experiment. Photons or matter (like electrons) produce an interference pattern when two slits are used. Light from a green laser passing through two slits 0.4 mm wide and 0.1 mm apart. In modern physics, the double-slit experiment demonstrates that light and matter can exhibit behavior characteristic of either waves or particles.
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